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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

/// Account is blocked from transferring tokens
error AccountBlocked();

/// Transfer exceeds the whale limit
error WhaleLimit();

/// Transfer exceeds the daily sell limit
error DailyLimit();

/// New value is out of bounds for consumer protection
error ConsumerProtection();

/// The Maxx Vault address has already been initialized or attempting to set to the zero address
error InitializationFailed();

/// MinTransferTax must be <= MaxTransferTax
error InvalidTax();

/// MinTaxAmount must be <= MaxTaxAmount
error InvalidTaxAmount();

error ZeroAddress();

/// @title Maxx Finance -- MAXX ERC20 token contract
/// @author Alta Web3 Labs - SonOfMosiah
contract MaxxFinance is ERC20, ERC20Burnable, AccessControl, Pausable {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

    /// @notice The amount of MAXX tokens burned
    uint256 public burnedAmount;

    /// @notice Deployment timestamp for this contract
    uint256 public immutable initialTimestamp;

    /// @notice Maxx Finance Vault address
    address public maxxVault;

    /// @notice block limited or not
    bool public isBlockLimited;

    /// @notice Global daily sell limit
    uint256 public globalDailySellLimit;

    /// @notice Whale limit
    uint256 public whaleLimit;

    /// @notice The number of blocks required
    uint256 public blocksBetweenTransfers;

    /// @notice Max tax rate when calling transfer() or transferFrom()
    uint16 public maxTransferTax; // 1000 = 10%
    /// @notice Min tax rate when calling transfer() or transferFrom()
    uint16 public minTransferTax; // 1000 = 10%

    /// @notice Threshold for the maximum tax rate
    uint256 public maxTaxAmount;
    /// @notice Ceiling amount qualified for the minimum tax rate
    uint256 public minTaxAmount;

    uint64 public constant GLOBAL_DAILY_SELL_LIMIT_MINIMUM = 1e9; // 1 billion
    uint64 public constant WHALE_LIMIT_MINIMUM = 1e6; // 1 million
    uint8 public constant BLOCKS_BETWEEN_TRANSFERS_MAXIMUM = 5;
    uint16 public constant TRANSFER_TAX_FACTOR = 1e4;
    uint64 public constant INITIAL_SUPPLY = 1e11;

    /// @notice blacklisted addresses
    mapping(address => bool) public isBlocked;

    /// @notice whitelisted addresses
    mapping(address => bool) public isAllowed;

    /// @notice tax exempt addresses
    mapping(address => bool) public isTaxExempt;

    /// @notice The block number of the address's last purchase from a pool
    mapping(address => uint256) public lastPurchase;

    /// @notice Whether the address is a Maxx token pool or not
    mapping(address => bool) public isPool;

    /// @notice The amount of tokens sold each day
    mapping(uint32 => uint256) public dailyAmountSold;

    event PoolAdded(address indexed pool);
    event PoolRemoved(address indexed pool);
    event MinTransferTaxUpdated(uint16 minTransferTax);
    event MaxTransferTaxUpdated(uint16 maxTransferTax);
    event MinTaxAmountUpdated(uint256 minTaxAmount);
    event MaxTaxAmountUpdated(uint256 maxTaxAmount);
    event BlocksBetweenTransfersUpdated(uint256 blocksBetweenTransfers);
    event BlockLimitedUpdated(bool blockLimited);
    event AddressAllowed(address indexed account);
    event AddressDisallowed(address indexed account);
    event AddressBlocked(address indexed account);
    event AddressUnblocked(address indexed account);
    event GlobalDailySellLimitUpdated(uint256 globalDailySellLimit);
    event WhaleLimitUpdated(uint256 whaleLimit);
    event TaxExemptAdded(address indexed account);
    event TaxExemptRemoved(address indexed account);

    constructor() ERC20("Maxx Finance", "MAXX") {
        _grantRole(DEFAULT_ADMIN_ROLE, tx.origin);
        initialTimestamp = block.timestamp;
    }

    function init(
        address _vault,
        uint16 _transferTax,
        uint256 _whaleLimit,
        uint256 _globalSellLimit
    ) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (maxxVault != address(0) || _vault == address(0)) {
            revert InitializationFailed();
        }
        maxxVault = _vault;
        _mint(maxxVault, INITIAL_SUPPLY * 10**decimals()); // Initial supply: 100 billion MAXX
        setMaxTransferTax(_transferTax);
        setMinTransferTax(_transferTax);
        setWhaleLimit(_whaleLimit);
        setGlobalDailySellLimit(_globalSellLimit);
    }

    /// @notice Mints tokens
    /// @dev Increases the token balance of `_to` by `amount`
    /// @param _to The address to mint to
    /// @param _amount The amount to mint
    function mint(address _to, uint256 _amount)
        external
        whenNotPaused
        onlyRole(MINTER_ROLE)
    {
        _mint(_to, _amount);
    }

    /// @notice identify an address as a liquidity pool
    /// @param _pool The pool address
    function addPool(address _pool) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (_pool == address(0)) {
            revert ZeroAddress();
        }
        isPool[_pool] = true;
        isAllowed[_pool] = true;
        emit PoolAdded(_pool);
    }

    /// @notice Remove an address from the pool list
    /// @param _pool The pool address
    function removePool(address _pool) external onlyRole(DEFAULT_ADMIN_ROLE) {
        isPool[_pool] = false;
        isAllowed[_pool] = false;
        emit PoolRemoved(_pool);
    }

    /// @notice Set the blocks required between transfers
    /// @param _blocksBetweenTransfers The number of blocks required between transfers
    function setBlocksBetweenTransfers(uint256 _blocksBetweenTransfers)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        if (_blocksBetweenTransfers > BLOCKS_BETWEEN_TRANSFERS_MAXIMUM) {
            revert ConsumerProtection();
        }
        blocksBetweenTransfers = _blocksBetweenTransfers;
        emit BlocksBetweenTransfersUpdated(_blocksBetweenTransfers);
    }

    /// @notice Update blockLimited
    /// @param _blockLimited Whether to block limit or not
    function updateBlockLimited(bool _blockLimited)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        isBlockLimited = _blockLimited;
        emit BlockLimitedUpdated(_blockLimited);
    }

    /// @notice add an address to the allowlist
    /// @param _address The address to add to the allowlist
    function allow(address _address) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (_address == address(0)) {
            revert ZeroAddress();
        }
        isAllowed[_address] = true;
        emit AddressAllowed(_address);
    }

    /// @notice remove an address from the allowlist
    /// @param _address The address to remove from the allowlist
    function disallow(address _address) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (_address == address(0)) {
            revert ZeroAddress();
        }
        isAllowed[_address] = false;
        emit AddressDisallowed(_address);
    }

    /// @notice add an address to the blocklist
    /// @dev "block" is a reserved symbol in Solidity, so we use "blockUser" instead
    /// @param _address The address to add to the blocklist
    function blockUser(address _address) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (_address == address(0)) {
            revert ZeroAddress();
        }
        isBlocked[_address] = true;
        emit AddressBlocked(_address);
    }

    /// @notice remove an address from the blocklist
    /// @param _address The address to remove from the blocklist
    function unblock(address _address) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (_address == address(0)) {
            revert ZeroAddress();
        }
        isBlocked[_address] = false;
        emit AddressUnblocked(_address);
    }

    /// @notice Pause the contract
    function pause() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _pause();
    }

    /// @notice Unpause the contract
    function unpause() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _unpause();
    }

    /// @notice Add an address to the tax exempt list
    /// @param _exempt The address to add to the tax exempt list
    function addTaxExempt(address _exempt)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        isTaxExempt[_exempt] = true;
        emit TaxExemptAdded(_exempt);
    }

    /// @notice Remove an address from the tax exempt list
    /// @param _exempt The address to remove from the tax exempt list
    function removeTaxExempt(address _exempt)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        isTaxExempt[_exempt] = false;
        emit TaxExemptRemoved(_exempt);
    }

    /// @notice Get the timestamp of the next day when the daily amount sold will be reset
    /// @return timestamp The timestamp corresponding to the next day when the global daily sell limit will be reset
    function getNextDayTimestamp() external view returns (uint256 timestamp) {
        uint256 day = uint256(getCurrentDay() + 1);
        timestamp = initialTimestamp + (day * 1 days);
    }

    /// @notice Set the min transfer tax percentage
    /// @dev Set minTransferTax to maxTransferTax for a flat tax
    /// @param _minTransferTax The minimum transfer tax to set
    function setMinTransferTax(uint16 _minTransferTax)
        public
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        if (_minTransferTax > maxTransferTax) {
            revert InvalidTax();
        }
        if (_minTransferTax > 2000 || _minTransferTax > maxTransferTax) {
            revert ConsumerProtection();
        }
        minTransferTax = _minTransferTax;
        emit MinTransferTaxUpdated(_minTransferTax);
    }

    /// @notice Set the max transfer tax percentage
    /// @dev Set maxTransferTax to minTransferTax for a flat tax
    /// @param _maxTransferTax The transfer tax to set
    function setMaxTransferTax(uint16 _maxTransferTax)
        public
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        if (_maxTransferTax < minTransferTax) {
            revert InvalidTax();
        }
        if (_maxTransferTax > 2000) {
            revert ConsumerProtection();
        }
        maxTransferTax = _maxTransferTax;
        emit MaxTransferTaxUpdated(_maxTransferTax);
    }

    /// @notice Set the min tax amount
    /// @param _minTaxAmount The minimum tax amount to set
    function setMinTaxAmount(uint256 _minTaxAmount)
        public
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        if (_minTaxAmount > maxTaxAmount) {
            revert InvalidTaxAmount();
        }
        minTaxAmount = _minTaxAmount;
        emit MinTaxAmountUpdated(_minTaxAmount);
    }

    /// @notice Set the max tax amount
    /// @param _maxTaxAmount The max tax amount to set
    function setMaxTaxAmount(uint256 _maxTaxAmount)
        public
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        if (_maxTaxAmount < minTaxAmount) {
            revert InvalidTaxAmount();
        }
        maxTaxAmount = _maxTaxAmount;
        emit MaxTaxAmountUpdated(_maxTaxAmount);
    }

    /// @dev Overrides the transfer() function and implements a transfer tax on lp pools
    /// @param _to The address to transfer to
    /// @param _amount The amount to transfer
    /// @return Whether the transfer was successful
    function transfer(address _to, uint256 _amount)
        public
        override
        whenNotPaused
        returns (bool)
    {
        // Wallet is blacklisted if they attempt to buy and then sell in the same block or consecutive blocks
        if (
            isBlockLimited &&
            isPool[_to] &&
            !isAllowed[msg.sender] &&
            lastPurchase[msg.sender] >= block.number - blocksBetweenTransfers
        ) {
            isBlocked[msg.sender] = true;
            return false;
        }

        if (
            (isPool[_to] || isPool[msg.sender]) &&
            (!isTaxExempt[msg.sender] && !isTaxExempt[_to])
        ) {
            uint256 tax = _getTaxAmount(_amount);
            _amount -= tax;
            require(super.transfer(maxxVault, tax / 2));
            burn(tax / 2);
        }
        return super.transfer(_to, _amount);
    }

    /// @dev Overrides the transferFrom() function and implements a transfer tax on lp pools
    /// @param _from The address to transfer from
    /// @param _to The address to transfer to
    /// @param _amount The amount to transfer
    /// @return Whether the transfer was successful
    function transferFrom(
        address _from,
        address _to,
        uint256 _amount
    ) public override whenNotPaused returns (bool) {
        // Wallet is blacklisted if they attempt to buy and then sell in the same block or consecutive blocks
        if (
            isBlockLimited &&
            isPool[_to] &&
            !isAllowed[_from] &&
            lastPurchase[_from] >= block.number - blocksBetweenTransfers
        ) {
            isBlocked[_from] = true;
            return false;
        }

        if (
            (isPool[_from] || isPool[_to]) &&
            (!isTaxExempt[_from] && !isTaxExempt[_to])
        ) {
            uint256 tax = _getTaxAmount(_amount);
            _amount -= tax;
            require(super.transferFrom(_from, maxxVault, tax / 2));
            burnFrom(_from, tax / 2);
        }
        return super.transferFrom(_from, _to, _amount);
    }

    /// @notice Set the global daily sell limit
    /// @param _globalDailySellLimit The new global daily sell limit
    function setGlobalDailySellLimit(uint256 _globalDailySellLimit)
        public
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        if (_globalDailySellLimit < GLOBAL_DAILY_SELL_LIMIT_MINIMUM) {
            revert ConsumerProtection();
        }
        globalDailySellLimit = _globalDailySellLimit * 10**decimals();
        emit GlobalDailySellLimitUpdated(_globalDailySellLimit);
    }

    /// @notice Set the whale limit
    /// @param _whaleLimit The new whale limit
    function setWhaleLimit(uint256 _whaleLimit)
        public
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        if (_whaleLimit < WHALE_LIMIT_MINIMUM) {
            revert ConsumerProtection();
        }
        whaleLimit = _whaleLimit * 10**decimals();
        emit WhaleLimitUpdated(_whaleLimit);
    }

    /// @notice This functions gets the current day since the initial timestamp
    /// @return day The current day since launch
    function getCurrentDay() public view returns (uint32 day) {
        day = uint32((block.timestamp - initialTimestamp) / 1 days);
        return day;
    }

    function _beforeTokenTransfer(
        address _from,
        address _to,
        uint256 _amount
    ) internal virtual override(ERC20) {
        bool allowed = isAllowed[_from];
        if ((isBlocked[_to] || isBlocked[_from]) && !allowed) {
            // can't send or receive tokens if the address is blocked
            revert AccountBlocked();
        }

        if (_to == address(0)) {
            // burn | burnFrom
            burnedAmount += _amount; // Burned amount is added to the total burned amount
        }

        if (_from != address(0) && _to != address(0)) {
            // transfer | transferFrom
            if (isPool[_from]) {
                // Also occurs if user is withdrawing their liquidity tokens.
                lastPurchase[_to] = block.number;
            } else if (isPool[_to]) {
                if (_amount > whaleLimit && !allowed) {
                    revert WhaleLimit();
                }

                uint32 day = getCurrentDay();
                dailyAmountSold[day] += _amount;
                if (dailyAmountSold[day] > globalDailySellLimit && !allowed) {
                    revert DailyLimit();
                }
            }
        }

        super._beforeTokenTransfer(_from, _to, _amount);
    }

    function _getTaxAmount(uint256 _amount)
        internal
        view
        returns (uint256 tax)
    {
        uint256 netAmount;

        if (_amount < minTaxAmount) {
            netAmount =
                (_amount * (TRANSFER_TAX_FACTOR - minTransferTax)) /
                TRANSFER_TAX_FACTOR;
        } else if (_amount > maxTaxAmount) {
            netAmount =
                (_amount * (TRANSFER_TAX_FACTOR - maxTransferTax)) /
                TRANSFER_TAX_FACTOR;
        } else {
            uint256 amountDiff = maxTaxAmount - minTaxAmount;
            uint256 taxDiff = maxTransferTax - minTransferTax;
            uint256 dynamicPoint = _amount - minTaxAmount;
            uint256 dynamicTransferTax = minTaxAmount +
                (dynamicPoint * taxDiff) /
                amountDiff;
            netAmount =
                (_amount * (TRANSFER_TAX_FACTOR - dynamicTransferTax)) /
                TRANSFER_TAX_FACTOR;
        }
        tax = _amount - netAmount;
        return tax;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @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 Contracts guidelines: functions revert
 * instead 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:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, 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) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, 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) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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 Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - 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 {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @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 {
        _spendAllowance(account, _msgSender(), amount);
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @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 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]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @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 virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @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]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        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 virtual 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.
     *
     * May emit a {RoleGranted} event.
     */
    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.
     *
     * May emit a {RoleRevoked} event.
     */
    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 revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    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.
     *
     * May emit a {RoleGranted} event.
     *
     * [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}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    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 {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @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 {AccessControl-_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 Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @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) external;

    /**
     * @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) external;

    /**
     * @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) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @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);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

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);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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