Contract 0x1659ffb2d40dfb1671ac226a0d9dcc95a774521a 4

/**
 *Submitted for verification at polygonscan.com on 2021-08-28
*/

// Sources flattened with hardhat v2.4.3 https://hardhat.org

// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
	/**
	 * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
	 * given ``owner``'s signed approval.
	 *
	 * IMPORTANT: The same issues {IERC20-approve} has related to transaction
	 * ordering also apply here.
	 *
	 * Emits an {Approval} event.
	 *
	 * Requirements:
	 *
	 * - `spender` cannot be the zero address.
	 * - `deadline` must be a timestamp in the future.
	 * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
	 * over the EIP712-formatted function arguments.
	 * - the signature must use ``owner``'s current nonce (see {nonces}).
	 *
	 * For more information on the signature format, see the
	 * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
	 * section].
	 */
	function permit(
		address owner,
		address spender,
		uint256 value,
		uint256 deadline,
		uint8 v,
		bytes32 r,
		bytes32 s
	) external;

	/**
	 * @dev Returns the current nonce for `owner`. This value must be
	 * included whenever a signature is generated for {permit}.
	 *
	 * Every successful call to {permit} increases ``owner``'s nonce by one. This
	 * prevents a signature from being used multiple times.
	 */
	function nonces(address owner) external view returns (uint256);

	/**
	 * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
	 */
	// solhint-disable-next-line func-name-mixedcase
	function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// File @openzeppelin/contracts/token/ERC20/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
	/**
	 * @dev Returns the amount of tokens in existence.
	 */
	function totalSupply() external view returns (uint256);

	/**
	 * @dev Returns the amount of tokens owned by `account`.
	 */
	function balanceOf(address account) external view returns (uint256);

	/**
	 * @dev Moves `amount` tokens from the caller's account to `recipient`.
	 *
	 * Returns a boolean value indicating whether the operation succeeded.
	 *
	 * Emits a {Transfer} event.
	 */
	function transfer(address recipient, uint256 amount) external returns (bool);

	/**
	 * @dev Returns the remaining number of tokens that `spender` will be
	 * allowed to spend on behalf of `owner` through {transferFrom}. This is
	 * zero by default.
	 *
	 * This value changes when {approve} or {transferFrom} are called.
	 */
	function allowance(address owner, address spender)
		external
		view
		returns (uint256);

	/**
	 * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
	 *
	 * Returns a boolean value indicating whether the operation succeeded.
	 *
	 * IMPORTANT: Beware that changing an allowance with this method brings the risk
	 * that someone may use both the old and the new allowance by unfortunate
	 * transaction ordering. One possible solution to mitigate this race
	 * condition is to first reduce the spender's allowance to 0 and set the
	 * desired value afterwards:
	 * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
	 *
	 * Emits an {Approval} event.
	 */
	function approve(address spender, uint256 amount) external returns (bool);

	/**
	 * @dev Moves `amount` tokens from `sender` to `recipient` using the
	 * allowance mechanism. `amount` is then deducted from the caller's
	 * allowance.
	 *
	 * Returns a boolean value indicating whether the operation succeeded.
	 *
	 * Emits a {Transfer} event.
	 */
	function transferFrom(
		address sender,
		address recipient,
		uint256 amount
	) external returns (bool);

	/**
	 * @dev Emitted when `value` tokens are moved from one account (`from`) to
	 * another (`to`).
	 *
	 * Note that `value` may be zero.
	 */
	event Transfer(address indexed from, address indexed to, uint256 value);

	/**
	 * @dev Emitted when the allowance of a `spender` for an `owner` is set by
	 * a call to {approve}. `value` is the new allowance.
	 */
	event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
	/**
	 * @dev Returns the name of the token.
	 */
	function name() external view returns (string memory);

	/**
	 * @dev Returns the symbol of the token.
	 */
	function symbol() external view returns (string memory);

	/**
	 * @dev Returns the decimals places of the token.
	 */
	function decimals() external view returns (uint8);
}

// File @openzeppelin/contracts/utils/[email protected]

pragma solidity ^0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
	function _msgSender() internal view virtual returns (address) {
		return msg.sender;
	}

	function _msgData() internal view virtual returns (bytes calldata) {
		return msg.data;
	}
}

// File @openzeppelin/contracts/token/ERC20/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
	mapping(address => uint256) private _balances;

	mapping(address => mapping(address => uint256)) private _allowances;

	uint256 private _totalSupply;

	string private _name;
	string private _symbol;

	/**
	 * @dev Sets the values for {name} and {symbol}.
	 *
	 * The default value of {decimals} is 18. To select a different value for
	 * {decimals} you should overload it.
	 *
	 * All two of these values are immutable: they can only be set once during
	 * construction.
	 */
	constructor(string memory name_, string memory symbol_) {
		_name = name_;
		_symbol = symbol_;
	}

	/**
	 * @dev Returns the name of the token.
	 */
	function name() public view virtual override returns (string memory) {
		return _name;
	}

	/**
	 * @dev Returns the symbol of the token, usually a shorter version of the
	 * name.
	 */
	function symbol() public view virtual override returns (string memory) {
		return _symbol;
	}

	/**
	 * @dev Returns the number of decimals used to get its user representation.
	 * For example, if `decimals` equals `2`, a balance of `505` tokens should
	 * be displayed to a user as `5,05` (`505 / 10 ** 2`).
	 *
	 * Tokens usually opt for a value of 18, imitating the relationship between
	 * Ether and Wei. This is the value {ERC20} uses, unless this function is
	 * overridden;
	 *
	 * NOTE: This information is only used for _display_ purposes: it in
	 * no way affects any of the arithmetic of the contract, including
	 * {IERC20-balanceOf} and {IERC20-transfer}.
	 */
	function decimals() public view virtual override returns (uint8) {
		return 18;
	}

	/**
	 * @dev See {IERC20-totalSupply}.
	 */
	function totalSupply() public view virtual override returns (uint256) {
		return _totalSupply;
	}

	/**
	 * @dev See {IERC20-balanceOf}.
	 */
	function balanceOf(address account)
		public
		view
		virtual
		override
		returns (uint256)
	{
		return _balances[account];
	}

	/**
	 * @dev See {IERC20-transfer}.
	 *
	 * Requirements:
	 *
	 * - `recipient` cannot be the zero address.
	 * - the caller must have a balance of at least `amount`.
	 */
	function transfer(address recipient, uint256 amount)
		public
		virtual
		override
		returns (bool)
	{
		_transfer(_msgSender(), recipient, amount);
		return true;
	}

	/**
	 * @dev See {IERC20-allowance}.
	 */
	function allowance(address owner, address spender)
		public
		view
		virtual
		override
		returns (uint256)
	{
		return _allowances[owner][spender];
	}

	/**
	 * @dev See {IERC20-approve}.
	 *
	 * Requirements:
	 *
	 * - `spender` cannot be the zero address.
	 */
	function approve(address spender, uint256 amount)
		public
		virtual
		override
		returns (bool)
	{
		_approve(_msgSender(), spender, amount);
		return true;
	}

	/**
	 * @dev See {IERC20-transferFrom}.
	 *
	 * Emits an {Approval} event indicating the updated allowance. This is not
	 * required by the EIP. See the note at the beginning of {ERC20}.
	 *
	 * Requirements:
	 *
	 * - `sender` and `recipient` cannot be the zero address.
	 * - `sender` must have a balance of at least `amount`.
	 * - the caller must have allowance for ``sender``'s tokens of at least
	 * `amount`.
	 */
	function transferFrom(
		address sender,
		address recipient,
		uint256 amount
	) public virtual override returns (bool) {
		_transfer(sender, recipient, amount);

		uint256 currentAllowance = _allowances[sender][_msgSender()];
		require(
			currentAllowance >= amount,
			"ERC20: transfer amount exceeds allowance"
		);
		unchecked {
			_approve(sender, _msgSender(), currentAllowance - amount);
		}

		return true;
	}

	/**
	 * @dev Atomically increases the allowance granted to `spender` by the caller.
	 *
	 * This is an alternative to {approve} that can be used as a mitigation for
	 * problems described in {IERC20-approve}.
	 *
	 * Emits an {Approval} event indicating the updated allowance.
	 *
	 * Requirements:
	 *
	 * - `spender` cannot be the zero address.
	 */
	function increaseAllowance(address spender, uint256 addedValue)
		public
		virtual
		returns (bool)
	{
		_approve(
			_msgSender(),
			spender,
			_allowances[_msgSender()][spender] + addedValue
		);
		return true;
	}

	/**
	 * @dev Atomically decreases the allowance granted to `spender` by the caller.
	 *
	 * This is an alternative to {approve} that can be used as a mitigation for
	 * problems described in {IERC20-approve}.
	 *
	 * Emits an {Approval} event indicating the updated allowance.
	 *
	 * Requirements:
	 *
	 * - `spender` cannot be the zero address.
	 * - `spender` must have allowance for the caller of at least
	 * `subtractedValue`.
	 */
	function decreaseAllowance(address spender, uint256 subtractedValue)
		public
		virtual
		returns (bool)
	{
		uint256 currentAllowance = _allowances[_msgSender()][spender];
		require(
			currentAllowance >= subtractedValue,
			"ERC20: decreased allowance below zero"
		);
		unchecked {
			_approve(_msgSender(), spender, currentAllowance - subtractedValue);
		}

		return true;
	}

	/**
	 * @dev Moves `amount` of tokens from `sender` to `recipient`.
	 *
	 * This internal function is equivalent to {transfer}, and can be used to
	 * e.g. implement automatic token fees, slashing mechanisms, etc.
	 *
	 * Emits a {Transfer} event.
	 *
	 * Requirements:
	 *
	 * - `sender` cannot be the zero address.
	 * - `recipient` cannot be the zero address.
	 * - `sender` must have a balance of at least `amount`.
	 */
	function _transfer(
		address sender,
		address recipient,
		uint256 amount
	) internal virtual {
		require(sender != address(0), "ERC20: transfer from the zero address");
		require(recipient != address(0), "ERC20: transfer to the zero address");

		_beforeTokenTransfer(sender, recipient, amount);

		uint256 senderBalance = _balances[sender];
		require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
		unchecked {
			_balances[sender] = senderBalance - amount;
		}
		_balances[recipient] += amount;

		emit Transfer(sender, recipient, amount);

		_afterTokenTransfer(sender, recipient, amount);
	}

	/** @dev Creates `amount` tokens and assigns them to `account`, increasing
	 * the total supply.
	 *
	 * Emits a {Transfer} event with `from` set to the zero address.
	 *
	 * Requirements:
	 *
	 * - `account` cannot be the zero address.
	 */
	function _mint(address account, uint256 amount) internal virtual {
		require(account != address(0), "ERC20: mint to the zero address");

		_beforeTokenTransfer(address(0), account, amount);

		_totalSupply += amount;
		_balances[account] += amount;
		emit Transfer(address(0), account, amount);

		_afterTokenTransfer(address(0), account, amount);
	}

	/**
	 * @dev Destroys `amount` tokens from `account`, reducing the
	 * total supply.
	 *
	 * Emits a {Transfer} event with `to` set to the zero address.
	 *
	 * Requirements:
	 *
	 * - `account` cannot be the zero address.
	 * - `account` must have at least `amount` tokens.
	 */
	function _burn(address account, uint256 amount) internal virtual {
		require(account != address(0), "ERC20: burn from the zero address");

		_beforeTokenTransfer(account, address(0), amount);

		uint256 accountBalance = _balances[account];
		require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
		unchecked {
			_balances[account] = accountBalance - amount;
		}
		_totalSupply -= amount;

		emit Transfer(account, address(0), amount);

		_afterTokenTransfer(account, address(0), amount);
	}

	/**
	 * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
	 *
	 * This internal function is equivalent to `approve`, and can be used to
	 * e.g. set automatic allowances for certain subsystems, etc.
	 *
	 * Emits an {Approval} event.
	 *
	 * Requirements:
	 *
	 * - `owner` cannot be the zero address.
	 * - `spender` cannot be the zero address.
	 */
	function _approve(
		address owner,
		address spender,
		uint256 amount
	) internal virtual {
		require(owner != address(0), "ERC20: approve from the zero address");
		require(spender != address(0), "ERC20: approve to the zero address");

		_allowances[owner][spender] = amount;
		emit Approval(owner, spender, amount);
	}

	/**
	 * @dev Hook that is called before any transfer of tokens. This includes
	 * minting and burning.
	 *
	 * Calling conditions:
	 *
	 * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
	 * will be transferred to `to`.
	 * - when `from` is zero, `amount` tokens will be minted for `to`.
	 * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
	 * - `from` and `to` are never both zero.
	 *
	 * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
	 */
	function _beforeTokenTransfer(
		address from,
		address to,
		uint256 amount
	) internal virtual {}

	/**
	 * @dev Hook that is called after any transfer of tokens. This includes
	 * minting and burning.
	 *
	 * Calling conditions:
	 *
	 * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
	 * has been transferred to `to`.
	 * - when `from` is zero, `amount` tokens have been minted for `to`.
	 * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
	 * - `from` and `to` are never both zero.
	 *
	 * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
	 */
	function _afterTokenTransfer(
		address from,
		address to,
		uint256 amount
	) internal virtual {}
}

// File @openzeppelin/contracts/utils/cryptography/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
	/**
	 * @dev Returns the address that signed a hashed message (`hash`) with
	 * `signature`. This address can then be used for verification purposes.
	 *
	 * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
	 * this function rejects them by requiring the `s` value to be in the lower
	 * half order, and the `v` value to be either 27 or 28.
	 *
	 * IMPORTANT: `hash` _must_ be the result of a hash operation for the
	 * verification to be secure: it is possible to craft signatures that
	 * recover to arbitrary addresses for non-hashed data. A safe way to ensure
	 * this is by receiving a hash of the original message (which may otherwise
	 * be too long), and then calling {toEthSignedMessageHash} on it.
	 *
	 * Documentation for signature generation:
	 * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
	 * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
	 */
	function recover(bytes32 hash, bytes memory signature)
		internal
		pure
		returns (address)
	{
		// Check the signature length
		// - case 65: r,s,v signature (standard)
		// - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
		if (signature.length == 65) {
			bytes32 r;
			bytes32 s;
			uint8 v;
			// ecrecover takes the signature parameters, and the only way to get them
			// currently is to use assembly.
			assembly {
				r := mload(add(signature, 0x20))
				s := mload(add(signature, 0x40))
				v := byte(0, mload(add(signature, 0x60)))
			}
			return recover(hash, v, r, s);
		} else if (signature.length == 64) {
			bytes32 r;
			bytes32 vs;
			// ecrecover takes the signature parameters, and the only way to get them
			// currently is to use assembly.
			assembly {
				r := mload(add(signature, 0x20))
				vs := mload(add(signature, 0x40))
			}
			return recover(hash, r, vs);
		} else {
			revert("ECDSA: invalid signature length");
		}
	}

	/**
	 * @dev Overload of {ECDSA-recover} that receives the `r` and `vs` short-signature fields separately.
	 *
	 * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
	 *
	 * _Available since v4.2._
	 */
	function recover(
		bytes32 hash,
		bytes32 r,
		bytes32 vs
	) internal pure returns (address) {
		bytes32 s;
		uint8 v;
		assembly {
			s := and(
				vs,
				0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
			)
			v := add(shr(255, vs), 27)
		}
		return recover(hash, v, r, s);
	}

	/**
	 * @dev Overload of {ECDSA-recover} that receives the `v`, `r` and `s` signature fields separately.
	 */
	function recover(
		bytes32 hash,
		uint8 v,
		bytes32 r,
		bytes32 s
	) internal pure returns (address) {
		// EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
		// unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
		// the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
		// signatures from current libraries generate a unique signature with an s-value in the lower half order.
		//
		// If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
		// with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
		// vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
		// these malleable signatures as well.
		require(
			uint256(s) <=
				0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0,
			"ECDSA: invalid signature 's' value"
		);
		require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");

		// If the signature is valid (and not malleable), return the signer address
		address signer = ecrecover(hash, v, r, s);
		require(signer != address(0), "ECDSA: invalid signature");

		return signer;
	}

	/**
	 * @dev Returns an Ethereum Signed Message, created from a `hash`. This
	 * produces hash corresponding to the one signed with the
	 * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
	 * JSON-RPC method as part of EIP-191.
	 *
	 * See {recover}.
	 */
	function toEthSignedMessageHash(bytes32 hash)
		internal
		pure
		returns (bytes32)
	{
		// 32 is the length in bytes of hash,
		// enforced by the type signature above
		return
			keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
	}

	/**
	 * @dev Returns an Ethereum Signed Typed Data, created from a
	 * `domainSeparator` and a `structHash`. This produces hash corresponding
	 * to the one signed with the
	 * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
	 * JSON-RPC method as part of EIP-712.
	 *
	 * See {recover}.
	 */
	function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash)
		internal
		pure
		returns (bytes32)
	{
		return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
	}
}

// File @openzeppelin/contracts/utils/cryptography/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
	/* solhint-disable var-name-mixedcase */
	// Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
	// invalidate the cached domain separator if the chain id changes.
	bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
	uint256 private immutable _CACHED_CHAIN_ID;

	bytes32 private immutable _HASHED_NAME;
	bytes32 private immutable _HASHED_VERSION;
	bytes32 private immutable _TYPE_HASH;

	/* solhint-enable var-name-mixedcase */

	/**
	 * @dev Initializes the domain separator and parameter caches.
	 *
	 * The meaning of `name` and `version` is specified in
	 * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
	 *
	 * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
	 * - `version`: the current major version of the signing domain.
	 *
	 * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
	 * contract upgrade].
	 */
	constructor(string memory name, string memory version) {
		bytes32 hashedName = keccak256(bytes(name));
		bytes32 hashedVersion = keccak256(bytes(version));
		bytes32 typeHash = keccak256(
			"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
		);
		_HASHED_NAME = hashedName;
		_HASHED_VERSION = hashedVersion;
		_CACHED_CHAIN_ID = block.chainid;
		_CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(
			typeHash,
			hashedName,
			hashedVersion
		);
		_TYPE_HASH = typeHash;
	}

	/**
	 * @dev Returns the domain separator for the current chain.
	 */
	function _domainSeparatorV4() internal view returns (bytes32) {
		if (block.chainid == _CACHED_CHAIN_ID) {
			return _CACHED_DOMAIN_SEPARATOR;
		} else {
			return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
		}
	}

	function _buildDomainSeparator(
		bytes32 typeHash,
		bytes32 nameHash,
		bytes32 versionHash
	) private view returns (bytes32) {
		return
			keccak256(
				abi.encode(
					typeHash,
					nameHash,
					versionHash,
					block.chainid,
					address(this)
				)
			);
	}

	/**
	 * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
	 * function returns the hash of the fully encoded EIP712 message for this domain.
	 *
	 * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
	 *
	 * ```solidity
	 * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
	 *     keccak256("Mail(address to,string contents)"),
	 *     mailTo,
	 *     keccak256(bytes(mailContents))
	 * )));
	 * address signer = ECDSA.recover(digest, signature);
	 * ```
	 */
	function _hashTypedDataV4(bytes32 structHash)
		internal
		view
		virtual
		returns (bytes32)
	{
		return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
	}
}

// File @openzeppelin/contracts/utils/[email protected]

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
	struct Counter {
		// This variable should never be directly accessed by users of the library: interactions must be restricted to
		// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
		// this feature: see https://github.com/ethereum/solidity/issues/4637
		uint256 _value; // default: 0
	}

	function current(Counter storage counter) internal view returns (uint256) {
		return counter._value;
	}

	function increment(Counter storage counter) internal {
		unchecked {
			counter._value += 1;
		}
	}

	function decrement(Counter storage counter) internal {
		uint256 value = counter._value;
		require(value > 0, "Counter: decrement overflow");
		unchecked {
			counter._value = value - 1;
		}
	}

	function reset(Counter storage counter) internal {
		counter._value = 0;
	}
}

// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * _Available since v3.4._
 */
abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 {
	using Counters for Counters.Counter;

	mapping(address => Counters.Counter) private _nonces;

	// solhint-disable-next-line var-name-mixedcase
	bytes32 private immutable _PERMIT_TYPEHASH =
		keccak256(
			"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
		);

	/**
	 * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`.
	 *
	 * It's a good idea to use the same `name` that is defined as the ERC20 token name.
	 */
	constructor(string memory name) EIP712(name, "1") {}

	/**
	 * @dev See {IERC20Permit-permit}.
	 */
	function permit(
		address owner,
		address spender,
		uint256 value,
		uint256 deadline,
		uint8 v,
		bytes32 r,
		bytes32 s
	) public virtual override {
		require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

		bytes32 structHash = keccak256(
			abi.encode(
				_PERMIT_TYPEHASH,
				owner,
				spender,
				value,
				_useNonce(owner),
				deadline
			)
		);

		bytes32 hash = _hashTypedDataV4(structHash);

		address signer = ECDSA.recover(hash, v, r, s);
		require(signer == owner, "ERC20Permit: invalid signature");

		_approve(owner, spender, value);
	}

	/**
	 * @dev See {IERC20Permit-nonces}.
	 */
	function nonces(address owner)
		public
		view
		virtual
		override
		returns (uint256)
	{
		return _nonces[owner].current();
	}

	/**
	 * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
	 */
	// solhint-disable-next-line func-name-mixedcase
	function DOMAIN_SEPARATOR() external view override returns (bytes32) {
		return _domainSeparatorV4();
	}

	/**
	 * @dev "Consume a nonce": return the current value and increment.
	 *
	 * _Available since v4.1._
	 */
	function _useNonce(address owner) internal virtual returns (uint256 current) {
		Counters.Counter storage nonce = _nonces[owner];
		current = nonce.current();
		nonce.increment();
	}
}

// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
	/**
	 * @dev Destroys `amount` tokens from the caller.
	 *
	 * See {ERC20-_burn}.
	 */
	function burn(uint256 amount) public virtual {
		_burn(_msgSender(), amount);
	}

	/**
	 * @dev Destroys `amount` tokens from `account`, deducting from the caller's
	 * allowance.
	 *
	 * See {ERC20-_burn} and {ERC20-allowance}.
	 *
	 * Requirements:
	 *
	 * - the caller must have allowance for ``accounts``'s tokens of at least
	 * `amount`.
	 */
	function burnFrom(address account, uint256 amount) public virtual {
		uint256 currentAllowance = allowance(account, _msgSender());
		require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
		unchecked {
			_approve(account, _msgSender(), currentAllowance - amount);
		}
		_burn(account, amount);
	}
}

// File @openzeppelin/contracts/utils/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
	bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

	/**
	 * @dev Converts a `uint256` to its ASCII `string` decimal representation.
	 */
	function toString(uint256 value) internal pure returns (string memory) {
		// Inspired by OraclizeAPI's implementation - MIT licence
		// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

		if (value == 0) {
			return "0";
		}
		uint256 temp = value;
		uint256 digits;
		while (temp != 0) {
			digits++;
			temp /= 10;
		}
		bytes memory buffer = new bytes(digits);
		while (value != 0) {
			digits -= 1;
			buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
			value /= 10;
		}
		return string(buffer);
	}

	/**
	 * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
	 */
	function toHexString(uint256 value) internal pure returns (string memory) {
		if (value == 0) {
			return "0x00";
		}
		uint256 temp = value;
		uint256 length = 0;
		while (temp != 0) {
			length++;
			temp >>= 8;
		}
		return toHexString(value, length);
	}

	/**
	 * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
	 */
	function toHexString(uint256 value, uint256 length)
		internal
		pure
		returns (string memory)
	{
		bytes memory buffer = new bytes(2 * length + 2);
		buffer[0] = "0";
		buffer[1] = "x";
		for (uint256 i = 2 * length + 1; i > 1; --i) {
			buffer[i] = _HEX_SYMBOLS[value & 0xf];
			value >>= 4;
		}
		require(value == 0, "Strings: hex length insufficient");
		return string(buffer);
	}
}

// File @openzeppelin/contracts/utils/introspection/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
	/**
	 * @dev Returns true if this contract implements the interface defined by
	 * `interfaceId`. See the corresponding
	 * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
	 * to learn more about how these ids are created.
	 *
	 * This function call must use less than 30 000 gas.
	 */
	function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File @openzeppelin/contracts/utils/introspection/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
	/**
	 * @dev See {IERC165-supportsInterface}.
	 */
	function supportsInterface(bytes4 interfaceId)
		public
		view
		virtual
		override
		returns (bool)
	{
		return interfaceId == type(IERC165).interfaceId;
	}
}

// File @openzeppelin/contracts/access/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
	function hasRole(bytes32 role, address account) external view returns (bool);

	function getRoleAdmin(bytes32 role) external view returns (bytes32);

	function grantRole(bytes32 role, address account) external;

	function revokeRole(bytes32 role, address account) external;

	function renounceRole(bytes32 role, address account) external;
}

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
	struct RoleData {
		mapping(address => bool) members;
		bytes32 adminRole;
	}

	mapping(bytes32 => RoleData) private _roles;

	bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

	/**
	 * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
	 *
	 * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
	 * {RoleAdminChanged} not being emitted signaling this.
	 *
	 * _Available since v3.1._
	 */
	event RoleAdminChanged(
		bytes32 indexed role,
		bytes32 indexed previousAdminRole,
		bytes32 indexed newAdminRole
	);

	/**
	 * @dev Emitted when `account` is granted `role`.
	 *
	 * `sender` is the account that originated the contract call, an admin role
	 * bearer except when using {_setupRole}.
	 */
	event RoleGranted(
		bytes32 indexed role,
		address indexed account,
		address indexed sender
	);

	/**
	 * @dev Emitted when `account` is revoked `role`.
	 *
	 * `sender` is the account that originated the contract call:
	 *   - if using `revokeRole`, it is the admin role bearer
	 *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
	 */
	event RoleRevoked(
		bytes32 indexed role,
		address indexed account,
		address indexed sender
	);

	/**
	 * @dev Modifier that checks that an account has a specific role. Reverts
	 * with a standardized message including the required role.
	 *
	 * The format of the revert reason is given by the following regular expression:
	 *
	 *  /^AccessControl: account (0x[0-9a-f]{20}) is missing role (0x[0-9a-f]{32})$/
	 *
	 * _Available since v4.1._
	 */
	modifier onlyRole(bytes32 role) {
		_checkRole(role, _msgSender());
		_;
	}

	/**
	 * @dev See {IERC165-supportsInterface}.
	 */
	function supportsInterface(bytes4 interfaceId)
		public
		view
		virtual
		override
		returns (bool)
	{
		return
			interfaceId == type(IAccessControl).interfaceId ||
			super.supportsInterface(interfaceId);
	}

	/**
	 * @dev Returns `true` if `account` has been granted `role`.
	 */
	function hasRole(bytes32 role, address account)
		public
		view
		override
		returns (bool)
	{
		return _roles[role].members[account];
	}

	/**
	 * @dev Revert with a standard message if `account` is missing `role`.
	 *
	 * The format of the revert reason is given by the following regular expression:
	 *
	 *  /^AccessControl: account (0x[0-9a-f]{20}) is missing role (0x[0-9a-f]{32})$/
	 */
	function _checkRole(bytes32 role, address account) internal view {
		if (!hasRole(role, account)) {
			revert(
				string(
					abi.encodePacked(
						"AccessControl: account ",
						Strings.toHexString(uint160(account), 20),
						" is missing role ",
						Strings.toHexString(uint256(role), 32)
					)
				)
			);
		}
	}

	/**
	 * @dev Returns the admin role that controls `role`. See {grantRole} and
	 * {revokeRole}.
	 *
	 * To change a role's admin, use {_setRoleAdmin}.
	 */
	function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
		return _roles[role].adminRole;
	}

	/**
	 * @dev Grants `role` to `account`.
	 *
	 * If `account` had not been already granted `role`, emits a {RoleGranted}
	 * event.
	 *
	 * Requirements:
	 *
	 * - the caller must have ``role``'s admin role.
	 */
	function grantRole(bytes32 role, address account)
		public
		virtual
		override
		onlyRole(getRoleAdmin(role))
	{
		_grantRole(role, account);
	}

	/**
	 * @dev Revokes `role` from `account`.
	 *
	 * If `account` had been granted `role`, emits a {RoleRevoked} event.
	 *
	 * Requirements:
	 *
	 * - the caller must have ``role``'s admin role.
	 */
	function revokeRole(bytes32 role, address account)
		public
		virtual
		override
		onlyRole(getRoleAdmin(role))
	{
		_revokeRole(role, account);
	}

	/**
	 * @dev Revokes `role` from the calling account.
	 *
	 * Roles are often managed via {grantRole} and {revokeRole}: this function's
	 * purpose is to provide a mechanism for accounts to lose their privileges
	 * if they are compromised (such as when a trusted device is misplaced).
	 *
	 * If the calling account had been granted `role`, emits a {RoleRevoked}
	 * event.
	 *
	 * Requirements:
	 *
	 * - the caller must be `account`.
	 */
	function renounceRole(bytes32 role, address account) public virtual override {
		require(
			account == _msgSender(),
			"AccessControl: can only renounce roles for self"
		);

		_revokeRole(role, account);
	}

	/**
	 * @dev Grants `role` to `account`.
	 *
	 * If `account` had not been already granted `role`, emits a {RoleGranted}
	 * event. Note that unlike {grantRole}, this function doesn't perform any
	 * checks on the calling account.
	 *
	 * [WARNING]
	 * ====
	 * This function should only be called from the constructor when setting
	 * up the initial roles for the system.
	 *
	 * Using this function in any other way is effectively circumventing the admin
	 * system imposed by {AccessControl}.
	 * ====
	 */
	function _setupRole(bytes32 role, address account) internal virtual {
		_grantRole(role, account);
	}

	/**
	 * @dev Sets `adminRole` as ``role``'s admin role.
	 *
	 * Emits a {RoleAdminChanged} event.
	 */
	function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
		emit RoleAdminChanged(role, getRoleAdmin(role), adminRole);
		_roles[role].adminRole = adminRole;
	}

	function _grantRole(bytes32 role, address account) private {
		if (!hasRole(role, account)) {
			_roles[role].members[account] = true;
			emit RoleGranted(role, account, _msgSender());
		}
	}

	function _revokeRole(bytes32 role, address account) private {
		if (hasRole(role, account)) {
			_roles[role].members[account] = false;
			emit RoleRevoked(role, account, _msgSender());
		}
	}
}

// File @openzeppelin/contracts/utils/structs/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
	// To implement this library for multiple types with as little code
	// repetition as possible, we write it in terms of a generic Set type with
	// bytes32 values.
	// The Set implementation uses private functions, and user-facing
	// implementations (such as AddressSet) are just wrappers around the
	// underlying Set.
	// This means that we can only create new EnumerableSets for types that fit
	// in bytes32.

	struct Set {
		// Storage of set values
		bytes32[] _values;
		// Position of the value in the `values` array, plus 1 because index 0
		// means a value is not in the set.
		mapping(bytes32 => uint256) _indexes;
	}

	/**
	 * @dev Add a value to a set. O(1).
	 *
	 * Returns true if the value was added to the set, that is if it was not
	 * already present.
	 */
	function _add(Set storage set, bytes32 value) private returns (bool) {
		if (!_contains(set, value)) {
			set._values.push(value);
			// The value is stored at length-1, but we add 1 to all indexes
			// and use 0 as a sentinel value
			set._indexes[value] = set._values.length;
			return true;
		} else {
			return false;
		}
	}

	/**
	 * @dev Removes a value from a set. O(1).
	 *
	 * Returns true if the value was removed from the set, that is if it was
	 * present.
	 */
	function _remove(Set storage set, bytes32 value) private returns (bool) {
		// We read and store the value's index to prevent multiple reads from the same storage slot
		uint256 valueIndex = set._indexes[value];

		if (valueIndex != 0) {
			// Equivalent to contains(set, value)
			// To delete an element from the _values array in O(1), we swap the element to delete with the last one in
			// the array, and then remove the last element (sometimes called as 'swap and pop').
			// This modifies the order of the array, as noted in {at}.

			uint256 toDeleteIndex = valueIndex - 1;
			uint256 lastIndex = set._values.length - 1;

			if (lastIndex != toDeleteIndex) {
				bytes32 lastvalue = set._values[lastIndex];

				// Move the last value to the index where the value to delete is
				set._values[toDeleteIndex] = lastvalue;
				// Update the index for the moved value
				set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
			}

			// Delete the slot where the moved value was stored
			set._values.pop();

			// Delete the index for the deleted slot
			delete set._indexes[value];

			return true;
		} else {
			return false;
		}
	}

	/**
	 * @dev Returns true if the value is in the set. O(1).
	 */
	function _contains(Set storage set, bytes32 value)
		private
		view
		returns (bool)
	{
		return set._indexes[value] != 0;
	}

	/**
	 * @dev Returns the number of values on the set. O(1).
	 */
	function _length(Set storage set) private view returns (uint256) {
		return set._values.length;
	}

	/**
	 * @dev Returns the value stored at position `index` in the set. O(1).
	 *
	 * Note that there are no guarantees on the ordering of values inside the
	 * array, and it may change when more values are added or removed.
	 *
	 * Requirements:
	 *
	 * - `index` must be strictly less than {length}.
	 */
	function _at(Set storage set, uint256 index) private view returns (bytes32) {
		return set._values[index];
	}

	// Bytes32Set

	struct Bytes32Set {
		Set _inner;
	}

	/**
	 * @dev Add a value to a set. O(1).
	 *
	 * Returns true if the value was added to the set, that is if it was not
	 * already present.
	 */
	function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
		return _add(set._inner, value);
	}

	/**
	 * @dev Removes a value from a set. O(1).
	 *
	 * Returns true if the value was removed from the set, that is if it was
	 * present.
	 */
	function remove(Bytes32Set storage set, bytes32 value)
		internal
		returns (bool)
	{
		return _remove(set._inner, value);
	}

	/**
	 * @dev Returns true if the value is in the set. O(1).
	 */
	function contains(Bytes32Set storage set, bytes32 value)
		internal
		view
		returns (bool)
	{
		return _contains(set._inner, value);
	}

	/**
	 * @dev Returns the number of values in the set. O(1).
	 */
	function length(Bytes32Set storage set) internal view returns (uint256) {
		return _length(set._inner);
	}

	/**
	 * @dev Returns the value stored at position `index` in the set. O(1).
	 *
	 * Note that there are no guarantees on the ordering of values inside the
	 * array, and it may change when more values are added or removed.
	 *
	 * Requirements:
	 *
	 * - `index` must be strictly less than {length}.
	 */
	function at(Bytes32Set storage set, uint256 index)
		internal
		view
		returns (bytes32)
	{
		return _at(set._inner, index);
	}

	// AddressSet

	struct AddressSet {
		Set _inner;
	}

	/**
	 * @dev Add a value to a set. O(1).
	 *
	 * Returns true if the value was added to the set, that is if it was not
	 * already present.
	 */
	function add(AddressSet storage set, address value) internal returns (bool) {
		return _add(set._inner, bytes32(uint256(uint160(value))));
	}

	/**
	 * @dev Removes a value from a set. O(1).
	 *
	 * Returns true if the value was removed from the set, that is if it was
	 * present.
	 */
	function remove(AddressSet storage set, address value)
		internal
		returns (bool)
	{
		return _remove(set._inner, bytes32(uint256(uint160(value))));
	}

	/**
	 * @dev Returns true if the value is in the set. O(1).
	 */
	function contains(AddressSet storage set, address value)
		internal
		view
		returns (bool)
	{
		return _contains(set._inner, bytes32(uint256(uint160(value))));
	}

	/**
	 * @dev Returns the number of values in the set. O(1).
	 */
	function length(AddressSet storage set) internal view returns (uint256) {
		return _length(set._inner);
	}

	/**
	 * @dev Returns the value stored at position `index` in the set. O(1).
	 *
	 * Note that there are no guarantees on the ordering of values inside the
	 * array, and it may change when more values are added or removed.
	 *
	 * Requirements:
	 *
	 * - `index` must be strictly less than {length}.
	 */
	function at(AddressSet storage set, uint256 index)
		internal
		view
		returns (address)
	{
		return address(uint160(uint256(_at(set._inner, index))));
	}

	// UintSet

	struct UintSet {
		Set _inner;
	}

	/**
	 * @dev Add a value to a set. O(1).
	 *
	 * Returns true if the value was added to the set, that is if it was not
	 * already present.
	 */
	function add(UintSet storage set, uint256 value) internal returns (bool) {
		return _add(set._inner, bytes32(value));
	}

	/**
	 * @dev Removes a value from a set. O(1).
	 *
	 * Returns true if the value was removed from the set, that is if it was
	 * present.
	 */
	function remove(UintSet storage set, uint256 value) internal returns (bool) {
		return _remove(set._inner, bytes32(value));
	}

	/**
	 * @dev Returns true if the value is in the set. O(1).
	 */
	function contains(UintSet storage set, uint256 value)
		internal
		view
		returns (bool)
	{
		return _contains(set._inner, bytes32(value));
	}

	/**
	 * @dev Returns the number of values on the set. O(1).
	 */
	function length(UintSet storage set) internal view returns (uint256) {
		return _length(set._inner);
	}

	/**
	 * @dev Returns the value stored at position `index` in the set. O(1).
	 *
	 * Note that there are no guarantees on the ordering of values inside the
	 * array, and it may change when more values are added or removed.
	 *
	 * Requirements:
	 *
	 * - `index` must be strictly less than {length}.
	 */
	function at(UintSet storage set, uint256 index)
		internal
		view
		returns (uint256)
	{
		return uint256(_at(set._inner, index));
	}
}

// File @openzeppelin/contracts/access/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControlEnumerable declared to support ERC165 detection.
 */
interface IAccessControlEnumerable {
	function getRoleMember(bytes32 role, uint256 index)
		external
		view
		returns (address);

	function getRoleMemberCount(bytes32 role) external view returns (uint256);
}

/**
 * @dev Extension of {AccessControl} that allows enumerating the members of each role.
 */
abstract contract AccessControlEnumerable is
	IAccessControlEnumerable,
	AccessControl
{
	using EnumerableSet for EnumerableSet.AddressSet;

	mapping(bytes32 => EnumerableSet.AddressSet) private _roleMembers;

	/**
	 * @dev See {IERC165-supportsInterface}.
	 */
	function supportsInterface(bytes4 interfaceId)
		public
		view
		virtual
		override
		returns (bool)
	{
		return
			interfaceId == type(IAccessControlEnumerable).interfaceId ||
			super.supportsInterface(interfaceId);
	}

	/**
	 * @dev Returns one of the accounts that have `role`. `index` must be a
	 * value between 0 and {getRoleMemberCount}, non-inclusive.
	 *
	 * Role bearers are not sorted in any particular way, and their ordering may
	 * change at any point.
	 *
	 * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
	 * you perform all queries on the same block. See the following
	 * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
	 * for more information.
	 */
	function getRoleMember(bytes32 role, uint256 index)
		public
		view
		override
		returns (address)
	{
		return _roleMembers[role].at(index);
	}

	/**
	 * @dev Returns the number of accounts that have `role`. Can be used
	 * together with {getRoleMember} to enumerate all bearers of a role.
	 */
	function getRoleMemberCount(bytes32 role)
		public
		view
		override
		returns (uint256)
	{
		return _roleMembers[role].length();
	}

	/**
	 * @dev Overload {grantRole} to track enumerable memberships
	 */
	function grantRole(bytes32 role, address account) public virtual override {
		super.grantRole(role, account);
		_roleMembers[role].add(account);
	}

	/**
	 * @dev Overload {revokeRole} to track enumerable memberships
	 */
	function revokeRole(bytes32 role, address account) public virtual override {
		super.revokeRole(role, account);
		_roleMembers[role].remove(account);
	}

	/**
	 * @dev Overload {renounceRole} to track enumerable memberships
	 */
	function renounceRole(bytes32 role, address account) public virtual override {
		super.renounceRole(role, account);
		_roleMembers[role].remove(account);
	}

	/**
	 * @dev Overload {_setupRole} to track enumerable memberships
	 */
	function _setupRole(bytes32 role, address account) internal virtual override {
		super._setupRole(role, account);
		_roleMembers[role].add(account);
	}
}

// File @openzeppelin/contracts/utils/math/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
	/**
	 * @dev Returns the largest of two numbers.
	 */
	function max(uint256 a, uint256 b) internal pure returns (uint256) {
		return a >= b ? a : b;
	}

	/**
	 * @dev Returns the smallest of two numbers.
	 */
	function min(uint256 a, uint256 b) internal pure returns (uint256) {
		return a < b ? a : b;
	}

	/**
	 * @dev Returns the average of two numbers. The result is rounded towards
	 * zero.
	 */
	function average(uint256 a, uint256 b) internal pure returns (uint256) {
		// (a + b) / 2 can overflow, so we distribute.
		return (a / 2) + (b / 2) + (((a % 2) + (b % 2)) / 2);
	}

	/**
	 * @dev Returns the ceiling of the division of two numbers.
	 *
	 * This differs from standard division with `/` in that it rounds up instead
	 * of rounding down.
	 */
	function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
		// (a + b - 1) / b can overflow on addition, so we distribute.
		return a / b + (a % b == 0 ? 0 : 1);
	}
}

// File @openzeppelin/contracts/utils/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to array types.
 */
library Arrays {
	/**
	 * @dev Searches a sorted `array` and returns the first index that contains
	 * a value greater or equal to `element`. If no such index exists (i.e. all
	 * values in the array are strictly less than `element`), the array length is
	 * returned. Time complexity O(log n).
	 *
	 * `array` is expected to be sorted in ascending order, and to contain no
	 * repeated elements.
	 */
	function findUpperBound(uint256[] storage array, uint256 element)
		internal
		view
		returns (uint256)
	{
		if (array.length == 0) {
			return 0;
		}

		uint256 low = 0;
		uint256 high = array.length;

		while (low < high) {
			uint256 mid = Math.average(low, high);

			// Note that mid will always be strictly less than high (i.e. it will be a valid array index)
			// because Math.average rounds down (it does integer division with truncation).
			if (array[mid] > element) {
				high = mid;
			} else {
				low = mid + 1;
			}
		}

		// At this point `low` is the exclusive upper bound. We will return the inclusive upper bound.
		if (low > 0 && array[low - 1] == element) {
			return low - 1;
		} else {
			return low;
		}
	}
}

// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]

pragma solidity ^0.8.0;

/**
 * @dev This contract extends an ERC20 token with a snapshot mechanism. When a snapshot is created, the balances and
 * total supply at the time are recorded for later access.
 *
 * This can be used to safely create mechanisms based on token balances such as trustless dividends or weighted voting.
 * In naive implementations it's possible to perform a "double spend" attack by reusing the same balance from different
 * accounts. By using snapshots to calculate dividends or voting power, those attacks no longer apply. It can also be
 * used to create an efficient ERC20 forking mechanism.
 *
 * Snapshots are created by the internal {_snapshot} function, which will emit the {Snapshot} event and return a
 * snapshot id. To get the total supply at the time of a snapshot, call the function {totalSupplyAt} with the snapshot
 * id. To get the balance of an account at the time of a snapshot, call the {balanceOfAt} function with the snapshot id
 * and the account address.
 *
 * NOTE: Snapshot policy can be customized by overriding the {_getCurrentSnapshotId} method. For example, having it
 * return `block.number` will trigger the creation of snapshot at the begining of each new block. When overridding this
 * function, be careful about the monotonicity of its result. Non-monotonic snapshot ids will break the contract.
 *
 * Implementing snapshots for every block using this method will incur significant gas costs. For a gas-efficient
 * alternative consider {ERC20Votes}.
 *
 * ==== Gas Costs
 *
 * Snapshots are efficient. Snapshot creation is _O(1)_. Retrieval of balances or total supply from a snapshot is _O(log
 * n)_ in the number of snapshots that have been created, although _n_ for a specific account will generally be much
 * smaller since identical balances in subsequent snapshots are stored as a single entry.
 *
 * There is a constant overhead for normal ERC20 transfers due to the additional snapshot bookkeeping. This overhead is
 * only significant for the first transfer that immediately follows a snapshot for a particular account. Subsequent
 * transfers will have normal cost until the next snapshot, and so on.
 */

abstract contract ERC20Snapshot is ERC20 {
	// Inspired by Jordi Baylina's MiniMeToken to record historical balances:
	// https://github.com/Giveth/minimd/blob/ea04d950eea153a04c51fa510b068b9dded390cb/contracts/MiniMeToken.sol

	using Arrays for uint256[];
	using Counters for Counters.Counter;

	// Snapshotted values have arrays of ids and the value corresponding to that id. These could be an array of a
	// Snapshot struct, but that would impede usage of functions that work on an array.
	struct Snapshots {
		uint256[] ids;
		uint256[] values;
	}

	mapping(address => Snapshots) private _accountBalanceSnapshots;
	Snapshots private _totalSupplySnapshots;

	// Snapshot ids increase monotonically, with the first value being 1. An id of 0 is invalid.
	Counters.Counter private _currentSnapshotId;

	/**
	 * @dev Emitted by {_snapshot} when a snapshot identified by `id` is created.
	 */
	event Snapshot(uint256 id);

	/**
	 * @dev Creates a new snapshot and returns its snapshot id.
	 *
	 * Emits a {Snapshot} event that contains the same id.
	 *
	 * {_snapshot} is `internal` and you have to decide how to expose it externally. Its usage may be restricted to a
	 * set of accounts, for example using {AccessControl}, or it may be open to the public.
	 *
	 * [WARNING]
	 * ====
	 * While an open way of calling {_snapshot} is required for certain trust minimization mechanisms such as forking,
	 * you must consider that it can potentially be used by attackers in two ways.
	 *
	 * First, it can be used to increase the cost of retrieval of values from snapshots, although it will grow
	 * logarithmically thus rendering this attack ineffective in the long term. Second, it can be used to target
	 * specific accounts and increase the cost of ERC20 transfers for them, in the ways specified in the Gas Costs
	 * section above.
	 *
	 * We haven't measured the actual numbers; if this is something you're interested in please reach out to us.
	 * ====
	 */
	function _snapshot() internal virtual returns (uint256) {
		_currentSnapshotId.increment();

		uint256 currentId = _getCurrentSnapshotId();
		emit Snapshot(currentId);
		return currentId;
	}

	/**
	 * @dev Get the current snapshotId
	 */
	function _getCurrentSnapshotId() internal view virtual returns (uint256) {
		return _currentSnapshotId.current();
	}

	/**
	 * @dev Retrieves the balance of `account` at the time `snapshotId` was created.
	 */
	function balanceOfAt(address account, uint256 snapshotId)
		public
		view
		virtual
		returns (uint256)
	{
		(bool snapshotted, uint256 value) = _valueAt(
			snapshotId,
			_accountBalanceSnapshots[account]
		);

		return snapshotted ? value : balanceOf(account);
	}

	/**
	 * @dev Retrieves the total supply at the time `snapshotId` was created.
	 */
	function totalSupplyAt(uint256 snapshotId)
		public
		view
		virtual
		returns (uint256)
	{
		(bool snapshotted, uint256 value) = _valueAt(
			snapshotId,
			_totalSupplySnapshots
		);

		return snapshotted ? value : totalSupply();
	}

	// Update balance and/or total supply snapshots before the values are modified. This is implemented
	// in the _beforeTokenTransfer hook, which is executed for _mint, _burn, and _transfer operations.
	function _beforeTokenTransfer(
		address from,
		address to,
		uint256 amount
	) internal virtual override {
		super._beforeTokenTransfer(from, to, amount);

		if (from == address(0)) {
			// mint
			_updateAccountSnapshot(to);
			_updateTotalSupplySnapshot();
		} else if (to == address(0)) {
			// burn
			_updateAccountSnapshot(from);
			_updateTotalSupplySnapshot();
		} else {
			// transfer
			_updateAccountSnapshot(from);
			_updateAccountSnapshot(to);
		}
	}

	function _valueAt(uint256 snapshotId, Snapshots storage snapshots)
		private
		view
		returns (bool, uint256)
	{
		require(snapshotId > 0, "ERC20Snapshot: id is 0");
		require(
			snapshotId <= _getCurrentSnapshotId(),
			"ERC20Snapshot: nonexistent id"
		);

		// When a valid snapshot is queried, there are three possibilities:
		//  a) The queried value was not modified after the snapshot was taken. Therefore, a snapshot entry was never
		//  created for this id, and all stored snapshot ids are smaller than the requested one. The value that corresponds
		//  to this id is the current one.
		//  b) The queried value was modified after the snapshot was taken. Therefore, there will be an entry with the
		//  requested id, and its value is the one to return.
		//  c) More snapshots were created after the requested one, and the queried value was later modified. There will be
		//  no entry for the requested id: the value that corresponds to it is that of the smallest snapshot id that is
		//  larger than the requested one.
		//
		// In summary, we need to find an element in an array, returning the index of the smallest value that is larger if
		// it is not found, unless said value doesn't exist (e.g. when all values are smaller). Arrays.findUpperBound does
		// exactly this.

		uint256 index = snapshots.ids.findUpperBound(snapshotId);

		if (index == snapshots.ids.length) {
			return (false, 0);
		} else {
			return (true, snapshots.values[index]);
		}
	}

	function _updateAccountSnapshot(address account) private {
		_updateSnapshot(_accountBalanceSnapshots[account], balanceOf(account));
	}

	function _updateTotalSupplySnapshot() private {
		_updateSnapshot(_totalSupplySnapshots, totalSupply());
	}

	function _updateSnapshot(Snapshots storage snapshots, uint256 currentValue)
		private
	{
		uint256 currentId = _getCurrentSnapshotId();
		if (_lastSnapshotId(snapshots.ids) < currentId) {
			snapshots.ids.push(currentId);
			snapshots.values.push(currentValue);
		}
	}

	function _lastSnapshotId(uint256[] storage ids)
		private
		view
		returns (uint256)
	{
		if (ids.length == 0) {
			return 0;
		} else {
			return ids[ids.length - 1];
		}
	}
}

// File contracts/interfaces/IChildToken.sol

pragma solidity 0.8.4;

interface IChildToken is IERC20 {
	/**
	 * @notice called when token is deposited on root chain
	 * @dev Should be callable only by ChildChainManager
	 * Should handle deposit by minting the required amount for user, not to create new tokens,
	 * but to move tokens previously swapped to the root chain back to the child chain
	 * @param user user address for whom deposit is being done
	 * @param depositData abi encoded amount
	 */
	function deposit(address user, bytes calldata depositData) external;
}

// File contracts/token/DailyCopTokenChild.sol

pragma solidity 0.8.4;

contract DailyCopTokenChild is
	AccessControlEnumerable,
	ERC20Burnable,
	ERC20Snapshot,
	ERC20Permit,
	IChildToken
{
	uint256 private _layer1Supply;

	// Roles
	bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
	bytes32 public constant DEPOSITOR_ROLE = keccak256("DEPOSITOR_ROLE");
	bytes32 public constant SNAPSHOT_ROLE = keccak256("SNAPSHOT_ROLE");

	modifier notThisAddress(address account) {
		require(
			account != address(this),
			"Address can not be the token contract's address"
		);
		_;
	}

	constructor(
		address defaultAdmin,
		address minter,
		address childChainManager
	) ERC20("Daily COP", "DLYCOP") ERC20Permit("DailyCopToken") {
		_setupRole(DEFAULT_ADMIN_ROLE, defaultAdmin);
		_setupRole(MINTER_ROLE, minter);

		// Only the child chain manager knows when a token is deposited on the root chain
		_setupRole(DEPOSITOR_ROLE, childChainManager);
	}

	/** @dev Creates `amount` tokens and assigns them to `account`, increasing
	 * the total supply.
	 *
	 * Emits a {Transfer} event with `from` set to the zero address.
	 *
	 * Requirements:
	 *
	 * - `account` cannot be the zero address.
	 * - `msg.sender` should have the minter role (MINTER_ROLE).
	 */
	function mint(address to, uint256 amount) public onlyRole(MINTER_ROLE) {
		_mint(to, amount);
	}

	/**
	 * @dev See {IERC20-transfer}.
	 *
	 * Requirements:
	 *
	 * - `recipient` cannot be the zero address.
	 * - the caller must have a balance of at least `amount`.
	 */
	function transfer(address recipient, uint256 amount)
		public
		virtual
		override(ERC20, IERC20)
		notThisAddress(recipient)
		returns (bool)
	{
		return super.transfer(recipient, amount);
	}

	/**
	 * @dev See {IERC20-transferFrom}.
	 *
	 * Emits an {Approval} event indicating the updated allowance. This is not
	 * required by the EIP. See the note at the beginning of {ERC20}.
	 *
	 * Requirements:
	 *
	 * - `sender` and `recipient` cannot be the zero address.
	 * - `sender` must have a balance of at least `amount`.
	 * - the caller must have allowance for ``sender``'s tokens of at least
	 * `amount`.
	 */
	function transferFrom(
		address sender,
		address recipient,
		uint256 amount
	)
		public
		virtual
		override(ERC20, IERC20)
		notThisAddress(recipient)
		returns (bool)
	{
		return super.transferFrom(sender, recipient, amount);
	}

	/**
	 * @dev Creates a new snapshot and returns its snapshot id.
	 *
	 * Emits a {Snapshot} event that contains the same id.
	 *
	 * {_snapshot} is `internal` and you have to decide how to expose it externally. Its usage may be restricted to a
	 * set of accounts, for example using {AccessControl}, or it may be open to the public.
	 *
	 * [WARNING]
	 * ====
	 * While an open way of calling {_snapshot} is required for certain trust minimization mechanisms such as forking,
	 * you must consider that it can potentially be used by attackers in two ways.
	 *
	 * First, it can be used to increase the cost of retrieval of values from snapshots, although it will grow
	 * logarithmically thus rendering this attack ineffective in the long term. Second, it can be used to target
	 * specific accounts and increase the cost of ERC20 transfers for them, in the ways specified in the Gas Costs
	 * section above.
	 *
	 * We haven't measured the actual numbers; if this is something you're interested in please reach out to us.
	 * ====
	 */
	function snapshot() public onlyRole(SNAPSHOT_ROLE) {
		_snapshot();
	}

	/**
	 * @notice called when token is deposited on root chain
	 * @dev Should be callable only by ChildChainManager
	 * Should handle deposit by minting the required amount for user, not to create new tokens,
	 * but to move tokens previously swapped to the root chain back to the child chain
	 * @param user user address for whom deposit is being done
	 * @param depositData abi encoded amount
	 */
	function deposit(address user, bytes calldata depositData)
		external
		override
		onlyRole(DEPOSITOR_ROLE)
	{
		uint256 amount = abi.decode(depositData, (uint256));
		// Keep track of token supply on layer 1 (root chain)
		_layer1Supply -= amount;
		_mint(user, amount);
	}

	/**
	 * @notice called when user wants to withdraw tokens back to root chain
	 * @dev Should burn user's tokens. This transaction will be verified when exiting on root chain
	 * @param amount amount of tokens to withdraw
	 */
	function withdraw(uint256 amount) external {
		// Keep track of token supply on layer 1 (root chain)
		_layer1Supply += amount;
		_burn(_msgSender(), amount);
	}

	/**
	 * @notice called when admin wants to unlock erc20 tokens owned by the contract
	 * @param _tokenAddress the address of the tokens to unlock
	 * @param _to the address to send the tokens to
	 * @param _amount amount of tokens to unlock
	 */
	function transferAnyERC20(
		address _tokenAddress,
		address _to,
		uint256 _amount
	) public onlyRole(DEFAULT_ADMIN_ROLE) {
		IERC20(_tokenAddress).transfer(_to, _amount);
	}

	/**
	 * @notice Obtain the supply of tokens that were moved to layer 1 (Ethereum) through the Polygon PoS bridge.
	 */
	function layer1Supply() public view returns (uint256) {
		return _layer1Supply;
	}

	function _beforeTokenTransfer(
		address from,
		address to,
		uint256 amount
	) internal virtual override(ERC20, ERC20Snapshot) {
		super._beforeTokenTransfer(from, to, amount);
	}
}

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00000000000000000000000096c2770900f4d0dd76819eca77cb3b40e119bdce00000000000000000000000056edbf72e30032d071bd09166984ccc74780334e000000000000000000000000a6fa4fb5f76172d178d61b04b0ecd319c5d1c0aa

-----Decoded View---------------
Arg [0] : defaultAdmin (address): 0x96c2770900f4d0dd76819eca77cb3b40e119bdce
Arg [1] : minter (address): 0x56edbf72e30032d071bd09166984ccc74780334e
Arg [2] : childChainManager (address): 0xa6fa4fb5f76172d178d61b04b0ecd319c5d1c0aa

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000096c2770900f4d0dd76819eca77cb3b40e119bdce
Arg [1] : 00000000000000000000000056edbf72e30032d071bd09166984ccc74780334e
Arg [2] : 000000000000000000000000a6fa4fb5f76172d178d61b04b0ecd319c5d1c0aa