// File: contracts/EyesClub.sol



// SPDX-License-Identifier: MITpragma solidity ^0.8.0;import "@openzeppelin/contracts/security/ReentrancyGuard.sol";import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";import "@openzeppelin/contracts/access/Ownable.sol";import "./ERC721A.sol";contract EyesClub is ERC721A, Ownable, ReentrancyGuard {	  using ECDSA for bytes32;    enum Status {        Pending,        PreSale,        PublicSale,        Finished    }        Status public status;        uint256 public PRICE = 0 ether;        string private _uri;    mapping(address => uint256) private _signerOfNum;    mapping(address => uint256) private _publicNumberMinted;        uint256 public immutable maxTotalSupply;    uint256 public immutable PreMaxMint;    uint256 public immutable PublicMaxMint;        event PaymentReleased(address to, uint256 amount);        constructor(string memory initURI, address signer1) ERC721A("EyesFi GlassE Pass", "EGPASS", 3) {        _uri = initURI;        maxTotalSupply = 10000;        PreMaxMint = 1;        PublicMaxMint = 3;        _signerOfNum[signer1] = 1;        status = Status.PreSale;    }        function _hash(uint256 salt, address _address) internal view returns (bytes32)    {        return keccak256(abi.encode(salt, address(this), _address));    }        function _verify(bytes32 hash, bytes memory token) internal view returns (uint256)    {        return _signerOfNum[_recover(hash, token)] ;    }        function _recover(bytes32 hash, bytes memory token) internal pure returns (address)    {        return hash.toEthSignedMessageHash().recover(token);    }        function _baseURI() internal view  override(ERC721A) returns (string memory) {        return _uri;    }        function setURI(string memory newuri) public virtual onlyOwner{        _uri = newuri;    }        function setPrice(uint256 _price) public virtual onlyOwner {        PRICE = _price;    }        function mint(uint256 num) external payable {        require(status == Status.PublicSale, "status is not publicSale");        require(publicNumberMinted(msg.sender) + num <= PublicMaxMint, "reach public mint number");        verified(num);        _safeMint(msg.sender,num);        _publicNumberMinted[msg.sender] = _publicNumberMinted[msg.sender] + num;    }        function preSaleMint(        uint256 amount,        uint256 salt,        bytes calldata token    ) external payable {        require(status == Status.PreSale, "status is not preSale");        uint256 preMaxMint = _verify(_hash(salt, msg.sender), token);        require(preMaxMint >= amount, "invalid preMax mint number");        require(numberMinted(msg.sender) + amount <= preMaxMint, "reach pre mint number");        verified(amount);        _safeMint(msg.sender, amount);    }        function setStatus(Status _status, address signer) external onlyOwner {        status = _status;        if(status == Status.PublicSale){            delete _signerOfNum[signer];            PRICE = 0.2 ether;        }    }        function verified(uint256 num) private {        require(num > 0, 'invalid mint number');        require(msg.value >= PRICE * num, 'invalid payable value');        if (msg.value > PRICE * num) {            payable(msg.sender).transfer(msg.value - PRICE * num);        }        require(totalSupply() + num <= maxTotalSupply, "reach max mint number");        require(tx.origin == msg.sender, "invalid msg sender");    }        function setSignerOfNum(address signer, uint256 num) external onlyOwner {        _signerOfNum[signer] = num;    }    function removeSignerOfNum(address signer) external onlyOwner {        delete _signerOfNum[signer];    }        function numberMinted(address owner) public view returns (uint256) {        return _numberMinted(owner);    }        function publicNumberMinted(address owner) public view returns (uint256) {        require(            owner != address(0),            "ERC721A: number minted query for the zero address"        );        return _publicNumberMinted[owner];    }        function release() public virtual nonReentrant onlyOwner{        require(address(this).balance > 0, "invalid balance");        Address.sendValue(payable(owner()), address(this).balance);        emit PaymentReleased(owner(), address(this).balance);    }}
// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @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 {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. 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]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // 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 tryRecover(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 tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @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.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // 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 (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): 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.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @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) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @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 Message, created from `s`. 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(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @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/access/Ownable.sol



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

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: contracts/ERC721A.sol



// SPDX-License-Identifier: MITpragma solidity ^0.8.0;import "@openzeppelin/contracts/token/ERC721/IERC721.sol";import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";import "@openzeppelin/contracts/utils/Address.sol";import "@openzeppelin/contracts/utils/Context.sol";import "@openzeppelin/contracts/utils/Strings.sol";import "@openzeppelin/contracts/utils/introspection/ERC165.sol";contract ERC721A isContext,ERC165,IERC721,IERC721Metadata,IERC721Enumerable{    using Address for address;    using Strings for uint256;    struct TokenOwnership {        address addr;        uint64 startTimestamp;    }    struct AddressData {        uint128 balance;        uint128 numberMinted;    }    uint256 private currentIndex = 0;    uint256 internal immutable maxBatchSize;    // Token name    string private _name;    // Token symbol    string private _symbol;    // Mapping from token ID to ownership details    // An empty struct value does not necessarily mean the token is unowned. See ownershipOf implementation for details.    mapping(uint256 => TokenOwnership) private _ownerships;    // Mapping owner address to address data    mapping(address => AddressData) private _addressData;    // Mapping from token ID to approved address    mapping(uint256 => address) private _tokenApprovals;    // Mapping from owner to operator approvals    mapping(address => mapping(address => bool)) private _operatorApprovals;    /**     * @dev     * `maxBatchSize` refers to how much a minter can mint at a time.     */    constructor(        string memory name_,        string memory symbol_,        uint256 maxBatchSize_    ) {        require(maxBatchSize_ > 0, "ERC721A: max batch size must be nonzero");        _name = name_;        _symbol = symbol_;        maxBatchSize = maxBatchSize_;    }    /**     * @dev See {IERC721Enumerable-totalSupply}.     */    function totalSupply() public view override returns (uint256) {        return currentIndex;    }    /**     * @dev See {IERC721Enumerable-tokenByIndex}.     */    function tokenByIndex(uint256 index) public view override returns (uint256) {        require(index < totalSupply(), "ERC721A: global index out of bounds");        return index;    }    /**     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.     * This read function is O(totalSupply). If calling from a separate contract, be sure to test gas first.     * It may also degrade with extremely large collection sizes (e.g >> 10000), test for your use case.     */    function tokenOfOwnerByIndex(address owner, uint256 index)    public    view    override    returns (uint256)    {        require(index < balanceOf(owner), "ERC721A: owner index out of bounds");        uint256 numMintedSoFar = totalSupply();        uint256 tokenIdsIdx = 0;        address currOwnershipAddr = address(0);        for (uint256 i = 0; i < numMintedSoFar; i++) {            TokenOwnership memory ownership = _ownerships[i];            if (ownership.addr != address(0)) {                currOwnershipAddr = ownership.addr;            }            if (currOwnershipAddr == owner) {                if (tokenIdsIdx == index) {                    return i;                }                tokenIdsIdx++;            }        }        revert("ERC721A: unable to get token of owner by index");    }    /**     * @dev See {IERC165-supportsInterface}.     */    function supportsInterface(bytes4 interfaceId)    public    view    virtual    override(ERC165, IERC165)    returns (bool)    {        return        interfaceId == type(IERC721).interfaceId ||        interfaceId == type(IERC721Metadata).interfaceId ||        interfaceId == type(IERC721Enumerable).interfaceId ||        super.supportsInterface(interfaceId);    }    /**     * @dev See {IERC721-balanceOf}.     */    function balanceOf(address owner) public view override returns (uint256) {        require(owner != address(0), "ERC721A: balance query for the zero address");        return uint256(_addressData[owner].balance);    }    function _numberMinted(address owner) internal view returns (uint256) {        require(            owner != address(0),            "ERC721A: number minted query for the zero address"        );        return uint256(_addressData[owner].numberMinted);    }    function ownershipOf(uint256 tokenId)    internal    view    returns (TokenOwnership memory)    {        require(_exists(tokenId), "ERC721A: owner query for nonexistent token");        uint256 lowestTokenToCheck;        if (tokenId >= maxBatchSize) {            lowestTokenToCheck = tokenId - maxBatchSize + 1;        }        for (uint256 curr = tokenId; curr >= lowestTokenToCheck; curr--) {            TokenOwnership memory ownership = _ownerships[curr];            if (ownership.addr != address(0)) {                return ownership;            }        }        revert("ERC721A: unable to determine the owner of token");    }    /**     * @dev See {IERC721-ownerOf}.     */    function ownerOf(uint256 tokenId) public view override returns (address) {        return ownershipOf(tokenId).addr;    }    /**     * @dev See {IERC721Metadata-name}.     */    function name() public view virtual override returns (string memory) {        return _name;    }    /**     * @dev See {IERC721Metadata-symbol}.     */    function symbol() public view virtual override returns (string memory) {        return _symbol;    }    /**     * @dev See {IERC721Metadata-tokenURI}.     */    function tokenURI(uint256 tokenId)    public    view    virtual    override    returns (string memory)    {        require(            _exists(tokenId),            "ERC721Metadata: URI query for nonexistent token"        );        string memory baseURI = _baseURI();        return        bytes(baseURI).length > 0        ? string(abi.encodePacked(baseURI, tokenId.toString()))        : "";    }    /**     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty     * by default, can be overriden in child contracts.     */    function _baseURI() internal view virtual returns (string memory) {        return "";    }    /**     * @dev See {IERC721-approve}.     */    function approve(address to, uint256 tokenId) public override {        address owner = ERC721A.ownerOf(tokenId);        require(to != owner, "ERC721A: approval to current owner");        require(            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),            "ERC721A: approve caller is not owner nor approved for all"        );        _approve(to, tokenId, owner);    }    /**     * @dev See {IERC721-getApproved}.     */    function getApproved(uint256 tokenId) public view override returns (address) {        require(_exists(tokenId), "ERC721A: approved query for nonexistent token");        return _tokenApprovals[tokenId];    }    /**     * @dev See {IERC721-setApprovalForAll}.     */    function setApprovalForAll(address operator, bool approved) public override {        require(operator != _msgSender(), "ERC721A: approve to caller");        _operatorApprovals[_msgSender()][operator] = approved;        emit ApprovalForAll(_msgSender(), operator, approved);    }    /**     * @dev See {IERC721-isApprovedForAll}.     */    function isApprovedForAll(address owner, address operator)    public    view    virtual    override    returns (bool)    {        return _operatorApprovals[owner][operator];    }    /**     * @dev See {IERC721-transferFrom}.     */    function transferFrom(        address from,        address to,        uint256 tokenId    ) public override {        _transfer(from, to, tokenId);    }    /**     * @dev See {IERC721-safeTransferFrom}.     */    function safeTransferFrom(        address from,        address to,        uint256 tokenId    ) public override {        safeTransferFrom(from, to, tokenId, "");    }    /**     * @dev See {IERC721-safeTransferFrom}.     */    function safeTransferFrom(        address from,        address to,        uint256 tokenId,        bytes memory _data    ) public override {        _transfer(from, to, tokenId);        require(            _checkOnERC721Received(from, to, tokenId, _data),            "ERC721A: transfer to non ERC721Receiver implementer"        );    }    /**     * @dev Returns whether `tokenId` exists.     *     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.     *     * Tokens start existing when they are minted (`_mint`),     */    function _exists(uint256 tokenId) internal view returns (bool) {        return tokenId < currentIndex;    }    function _safeMint(address to, uint256 quantity) internal {        _safeMint(to, quantity, "");    }    /**     * @dev Mints `quantity` tokens and transfers them to `to`.     *     * Requirements:     *     * - `to` cannot be the zero address.     * - `quantity` cannot be larger than the max batch size.     *     * Emits a {Transfer} event.     */    function _safeMint(        address to,        uint256 quantity,        bytes memory _data    ) internal {        uint256 startTokenId = currentIndex;        require(to != address(0), "ERC721A: mint to the zero address");        // We know if the first token in the batch doesn't exist, the other ones don't as well, because of serial ordering.        require(!_exists(startTokenId), "ERC721A: token already minted");        require(quantity <= maxBatchSize, "ERC721A: quantity to mint too high");        _beforeTokenTransfers(address(0), to, startTokenId, quantity);        AddressData memory addressData = _addressData[to];        _addressData[to] = AddressData(            addressData.balance + uint128(quantity),            addressData.numberMinted + uint128(quantity)        );        _ownerships[startTokenId] = TokenOwnership(to, uint64(block.timestamp));        uint256 updatedIndex = startTokenId;        for (uint256 i = 0; i < quantity; i++) {            emit Transfer(address(0), to, updatedIndex);            require(                _checkOnERC721Received(address(0), to, updatedIndex, _data),                "ERC721A: transfer to non ERC721Receiver implementer"            );            updatedIndex++;        }        currentIndex = updatedIndex;        _afterTokenTransfers(address(0), to, startTokenId, quantity);    }    /**     * @dev Transfers `tokenId` from `from` to `to`.     *     * Requirements:     *     * - `to` cannot be the zero address.     * - `tokenId` token must be owned by `from`.     *     * Emits a {Transfer} event.     */    function _transfer(        address from,        address to,        uint256 tokenId    ) private {        TokenOwnership memory prevOwnership = ownershipOf(tokenId);        bool isApprovedOrOwner = (_msgSender() == prevOwnership.addr ||        getApproved(tokenId) == _msgSender() ||        isApprovedForAll(prevOwnership.addr, _msgSender()));        require(            isApprovedOrOwner,            "ERC721A: transfer caller is not owner nor approved"        );        require(            prevOwnership.addr == from,            "ERC721A: transfer from incorrect owner"        );        require(to != address(0), "ERC721A: transfer to the zero address");        _beforeTokenTransfers(from, to, tokenId, 1);        // Clear approvals from the previous owner        _approve(address(0), tokenId, prevOwnership.addr);        _addressData[from].balance -= 1;        _addressData[to].balance += 1;        _ownerships[tokenId] = TokenOwnership(to, uint64(block.timestamp));        // If the ownership slot of tokenId+1 is not explicitly set, that means the transfer initiator owns it.        // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.        uint256 nextTokenId = tokenId + 1;        if (_ownerships[nextTokenId].addr == address(0)) {            if (_exists(nextTokenId)) {                _ownerships[nextTokenId] = TokenOwnership(                    prevOwnership.addr,                    prevOwnership.startTimestamp                );            }        }        emit Transfer(from, to, tokenId);        _afterTokenTransfers(from, to, tokenId, 1);    }    /**     * @dev Approve `to` to operate on `tokenId`     *     * Emits a {Approval} event.     */    function _approve(        address to,        uint256 tokenId,        address owner    ) private {        _tokenApprovals[tokenId] = to;        emit Approval(owner, to, tokenId);    }    uint256 public nextOwnerToExplicitlySet = 0;    /**     * @dev Explicitly set `owners` to eliminate loops in future calls of ownerOf().     */    function _setOwnersExplicit(uint256 quantity) internal {        uint256 oldNextOwnerToSet = nextOwnerToExplicitlySet;        require(quantity > 0, "quantity must be nonzero");        uint256 endIndex = oldNextOwnerToSet + quantity - 1;        if (endIndex > currentIndex - 1) {            endIndex = currentIndex - 1;        }        // We know if the last one in the group exists, all in the group exist, due to serial ordering.        require(_exists(endIndex), "not enough minted yet for this cleanup");        for (uint256 i = oldNextOwnerToSet; i <= endIndex; i++) {            if (_ownerships[i].addr == address(0)) {                TokenOwnership memory ownership = ownershipOf(i);                _ownerships[i] = TokenOwnership(                    ownership.addr,                    ownership.startTimestamp                );            }        }        nextOwnerToExplicitlySet = endIndex + 1;    }    /**     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.     * The call is not executed if the target address is not a contract.     *     * @param from address representing the previous owner of the given token ID     * @param to target address that will receive the tokens     * @param tokenId uint256 ID of the token to be transferred     * @param _data bytes optional data to send along with the call     * @return bool whether the call correctly returned the expected magic value     */    function _checkOnERC721Received(        address from,        address to,        uint256 tokenId,        bytes memory _data    ) private returns (bool) {        if (to.isContract()) {            try            IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data)            returns (bytes4 retval) {                return retval == IERC721Receiver(to).onERC721Received.selector;            } catch (bytes memory reason) {                if (reason.length == 0) {                    revert("ERC721A: transfer to non ERC721Receiver implementer");                } else {                    assembly {                        revert(add(32, reason), mload(reason))                    }                }            }        } else {            return true;        }    }    /**     * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.     *     * startTokenId - the first token id to be transferred     * quantity - the amount to be transferred     *     * Calling conditions:     *     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be     * transferred to `to`.     * - When `from` is zero, `tokenId` will be minted for `to`.     */    function _beforeTokenTransfers(        address from,        address to,        uint256 startTokenId,        uint256 quantity    ) internal virtual {}    /**     * @dev Hook that is called after a set of serially-ordered token ids have been transferred. This includes     * minting.     *     * startTokenId - the first token id to be transferred     * quantity - the amount to be transferred     *     * Calling conditions:     *     * - when `from` and `to` are both non-zero.     * - `from` and `to` are never both zero.     */    function _afterTokenTransfers(        address from,        address to,        uint256 startTokenId,        uint256 quantity    ) internal virtual {}}
// File: @openzeppelin/contracts/utils/Strings.sol



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

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/Context.sol



// 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;
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol



// 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;
    }
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



// 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);
}