// File: contracts/Ingredient.sol



// SPDX-License-Identifier: Unlicense
// Creator: Mr. Masterchef

pragma solidity ^0.8.9;

//       __|__ |___| |\
//       |o__| |___| | \
//       |___| |___| |o \
//      _|___| |___| |__o\
//     /...\_____|___|____\___/
//     \   o * o * * o * o  /
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//    ~~~     ~~~~     ~~~   ~~
//  ~~  ~~~~~   ~~~   ~~  ~   ~~
//
// K
// mb
// ewk
// wpqb
// ttfkx
// wloj
// cct
// dx
// blad
// dqlpti
// dewqibmw
// pjlhbflBmw
// lkpktdzp
// mdgbro
// tdew
// lkwqyjwl
// xdeadkhddqbs
// swedqkbtbqedlldq
// kwbtsxbqydlBsswedqkb
// tsxbqydlbmdpqdlk
// xbkepqkmdljt
// kwqbsxbq
// ydwqbqpavdsklwed
// qkwkfbzkdmkxdsxbqydljsxb
// lhxdqbxpjldwlobwqkdepmpqdlxbwmkj
// mqlymbfdksBmwlkpktdkxpjyxkpzkxdldblsxbqy
// dlwqkxdbsswedqkbtompodmkwdlpzbkx
// wqyDlldqkwbtsxbqydlafspq
// kmblkbmdkxpldhxw
// sxepqkomdldmidkxdwedqkwkfpzkxdpa
// vdskhxdqwksxbqydlljsxblhxdqbxpjldajmqlkpkxdympjq
// ebqeadsprdlblxdlpmhxdqlprdpqdewdlBmrdehwkxkxdldewlkwqskwpqlBmwlk
// pktdhpjtekxdqlbfkxbkwqkxdsbldpzbsswedqkbtsxbqydlwlzbtldbsxbqywqykxwqysbqmdbttfsx
// bqydpqdpzwklbsswedqkbtompodmkwdlbqefdktwkdmbttfmdrbwqpqdbqekxdlb
// rdkxwqyadzpmdbqebzkdmkxdsxbqydPzspjmldkxwllptjkw
// pqkpkxdojcctdedodqelpqkxdmdadwqy
// bspxdmdqkewlkwqs
// kwpqadkhddqbsswedqkbtbqe
// dlldqkwbtsxbqydlbqeadkhddqbsswed
// qkbtbqedlldqkwbtompodmkwdlLprdoxwtplpoxd
// mlzwqekxwlewlkwqskwpqompatdrbkws
// bqexbidedidtpodepkxdmlpt
// jkwpqlkxbkepqkmd
// njwmdkxw
// lewlkwqskwpq
// Wqhxbkzpttphlhde
// wlsjllkxdldlptjkwpql
// kpkxdojcctdbtpqy
// hwkxpkxdmojc
// ctdlkxbk
// bmwl
// dhxdqs
// pqlwedmw
// qykxdwedqk
// wkfpzpav
// dsklpi
// dmkw
// rd
//
//                P
//             P /\  P
//            /\|  |/\
//         [] ||_/\_|| []
//         ||_||____||_||
//         ||____[]____||
//    ___ {::     \__    } ___
//   (     \v:    .'"  _V  -- )_
//  (__---  \_      __/  ---     )
//    (       |::\ :/  ----- ___)
//     (______ \::\/     _____)
//       (____  \ /   _____)
//               V

import "./ERC721TopLevel.sol";

contract Ingredient is ERC721TopLevel {
    bytes32 public solvesyWordz;
    uint256 private howManyWordz;

    string private _notSolveddd = "";
    string private _ooooShinyy = "";

    mapping(address => bool) public isRevealed;

    constructor(
        address werIzDaInfo,
        string memory name_,
        string memory symbol_,
        string memory description_,
        string memory image_
    ) ERC721TopLevel() {
        ERC721StorageProto(werIzDaInfo).registerTopLevel(name_, symbol_, description_, image_);

        setStorageLayer(werIzDaInfo);
    }

    //////////

    function setSolutionHash(bytes32 wotWurdz_, uint256 howManyyy_) public onlyOwner {
        solvesyWordz = wotWurdz_;
        howManyWordz = howManyyy_;
    }

    function youreekcar(string[] memory whoaa) public {
        require(howManyWordz > 0, "nw0");
        require(whoaa.length == howManyWordz, "nw");
        bytes32 amIRiteOrWut = keccak256(abi.encodePacked("eggzzz"));
        for (uint256 i = 0; i < whoaa.length; i++) {
            amIRiteOrWut = keccak256(abi.encodePacked(amIRiteOrWut, whoaa[i]));
        }
        require(amIRiteOrWut == solvesyWordz, "sln");

        isRevealed[msg.sender] = true;
    }

    function hmmmHmmmmm(string memory hmmm___) public onlyOwner {
        _notSolveddd = hmmm___;
    }

    function AHA(string memory ahhh___) public onlyOwner {
        _ooooShinyy = ahhh___;
    }

    //////////

    function tokenURI(uint256 tokenId) public view returns (string memory) {
        if (isRevealed[ownerOf(tokenId)]) {
            return _ooooShinyy;
        }
        else {
            return _notSolveddd;
        }
    }

    //////////

    function urBlocced(address whomst) public onlyOwner {
        _restrictOperator(whomst);
    }

    function unbloccc(address whomst) public onlyOwner {
        _releaseOperator(whomst);
    }

    function noMoarBlok() public onlyOwner {
        _preventNewRestrictions();
    }
}

////////////////////////////////////////




















// File: contracts/ERC721TopLevel.sol



// SPDX-License-Identifier: Unlicense
// Creator: Mr. Masterchef

pragma solidity ^0.8.9;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract ERC721TopLevel is ERC165, Ownable {
    using Address for address;
    using Strings for uint256;

    /**
     * @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 Storage layer contract that separates out internal minting logic from top level functions
     *   - Designed to reduce top level contract size and enable implementation of additional functionality
    **/
    ERC721StorageProto public storageLayer;
    bool public storageLayerSet = false;
    modifier onlyStorage() {
        _isStorage();
        _;
    }
    function _isStorage() internal view virtual {
        require(msg.sender == address(storageLayer), "not storage");
    }

    /******************/

    constructor() Ownable() {}

    /******************/

    /**
     * @dev Mapping from addresses to whether or not an address is restricted as an operator for all
    **/
    mapping(address => bool) public operatorRestrictions;
    bool public canRestrict = true; // Determines whether or not the contract owner can still restrict any new addresses

    /**
     * @dev Sets the storage layer for this top-level contract and prevents it from being reset
    **/
    function setStorageLayer(address storageLayerAddress_) public onlyOwner {
        require(!storageLayerSet, "sls");
        storageLayer = ERC721StorageProto(storageLayerAddress_);
        storageLayerSet = true;
    }

    /**
     * @dev get the address of the storage layer contract
    **/
    function _storageLayerAddress() public view returns (address) {
        return address(storageLayer);
    }

    /**
     * @dev Restrict an address from being an operator for all
    **/
    function _restrictOperator(address operator) internal {
        require(canRestrict, "nnr");

        operatorRestrictions[operator] = true;
    }

    /**
     * @dev Release an address from restriction, permitting it to be an operator for all
    **/
    function _releaseOperator(address operator) internal {
        operatorRestrictions[operator] = false;
    }

    /**
     * @dev Prevent the contract owner from restricting any additional operators
    **/
    function _preventNewRestrictions() internal {
        canRestrict = false;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
    **/
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165) returns (bool) {
        return (interfaceId == type(IERC721).interfaceId ||
        interfaceId == type(IERC721Metadata).interfaceId ||
        interfaceId == type(IERC721Enumerable).interfaceId ||
        super.supportsInterface(interfaceId));
    }

    function totalSupply() public view returns (uint256) {
        return storageLayer.storage_totalSupply(address(this));
    }

    function tokenByIndex(uint256 index) public view returns (uint256) {
        return storageLayer.storage_tokenByIndex(address(this), index);
    }

    function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256) {
        return storageLayer.storage_tokenOfOwnerByIndex(address(this), owner, index);
    }

    function tokenOfOwnerByIndexStepped(
        address owner,
        uint256 index,
        uint256 lastToken,
        uint256 lastIndex
    ) public view returns (uint256) {
        return storageLayer.storage_tokenOfOwnerByIndexStepped(
            address(this), owner, index, lastToken, lastIndex
        );
    }

    function balanceOf(address owner) public view returns (uint256) {
        return storageLayer.storage_balanceOf(address(this), owner);
    }

    function ownerOf(uint256 tokenId) public view returns (address) {
        return storageLayer.storage_ownerOf(address(this), tokenId);
    }

    function name() public view virtual returns (string memory) {
        return storageLayer.storage_name(address(this));
    }

    function symbol() public view virtual returns (string memory) {
        return storageLayer.storage_symbol(address(this));
    }

    function approve(address to, uint256 tokenId) public {
        storageLayer.storage_approve(msg.sender, to, tokenId);
    }

    function getApproved(uint256 tokenId) public view returns (address) {
        return storageLayer.storage_getApproved(address(this), tokenId);
    }

    function setApprovalForAll(address operator, bool approved) public {
        require(!(operatorRestrictions[operator]), "r");

        storageLayer.storage_setApprovalForAll(msg.sender, operator, approved);
    }

    function isApprovedForAll(address owner, address operator) public view returns (bool) {
        return storageLayer.storage_isApprovedForAll(address(this), owner, operator);
    }

    function transferFrom(address from, address to, uint256 tokenId) public {
        storageLayer.storage_transferFrom(msg.sender, from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId) public {
        storageLayer.storage_safeTransferFrom(msg.sender, from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public {
        storageLayer.storage_safeTransferFrom(msg.sender, from, to, tokenId, _data);
    }

    function burnToken(uint256 tokenId) public {
        storageLayer.storage_burnToken(msg.sender, tokenId);
    }

    function exists(uint256 tokenId) public view returns (bool) {
        return storageLayer.storage_exists(address(this), tokenId);
    }

    function contractURI() public view returns (string memory) {
        return storageLayer.storage_contractURI(address(this));
    }

    //////////

    function emitTransfer(address from, address to, uint256 tokenId) public onlyStorage {
        emit Transfer(from, to, tokenId);
    }

    function emitApproval(address owner, address approved, uint256 tokenId) public onlyStorage {
        emit Approval(owner, approved, tokenId);
    }

    function emitApprovalForAll(address owner, address operator, bool approved) public onlyStorage {
        emit ApprovalForAll(owner, operator, approved);
    }

    //////////

    receive() external payable {
        (bool success, ) = payable(storageLayer.mintingContract()).call{value: msg.value}("");
        require(success, "F");
    }

    function withdrawTokens(address tokenAddress) external onlyOwner {
        IERC20(tokenAddress).transfer(msg.sender, IERC20(tokenAddress).balanceOf(address(this)));
    }
}

////////////////////

abstract contract ERC721StorageProto {
    address public mintingContract;

    //////////

    function registerTopLevel(
        string memory name_,
        string memory symbol_,
        string memory description_,
        string memory image_
    ) public virtual;

    //////////

    function storage_totalSupply(address collection) public view virtual returns (uint256);

    function storage_tokenByIndex(address collection, uint256 index) public view virtual returns (uint256);

    function storage_tokenOfOwnerByIndex(
        address collection,
        address owner,
        uint256 index
    ) public view virtual returns (uint256);

    function storage_tokenOfOwnerByIndexStepped(
        address collection,
        address owner,
        uint256 index,
        uint256 lastToken,
        uint256 lastIndex
    ) public view virtual returns (uint256);

    function storage_balanceOf(address collection, address owner) public view virtual returns (uint256);

    function storage_ownerOf(address collection, uint256 tokenId) public view virtual returns (address);

    function storage_name(address collection) public view virtual returns (string memory);

    function storage_symbol(address collection) public view virtual returns (string memory);

    function storage_approve(address msgSender, address to, uint256 tokenId) public virtual;

    function storage_getApproved(address collection, uint256 tokenId) public view virtual returns (address);

    function storage_setApprovalForAll(address msgSender, address operator, bool approved) public virtual;

    function storage_isApprovedForAll(
        address collection,
        address owner,
        address operator
    ) public view virtual returns (bool);

    function storage_transferFrom(
        address msgSender,
        address from,
        address to,
        uint256 tokenId
    ) public virtual;

    function storage_safeTransferFrom(
        address msgSender,
        address from,
        address to,
        uint256 tokenId
    ) public virtual;

    function storage_safeTransferFrom(
        address msgSender,
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual;

    function storage_burnToken(address msgSender, uint256 tokenId) public virtual;

    function storage_exists(address collection, uint256 tokenId) public view virtual returns (bool);

    function storage_safeMint(address msgSender, address to, uint256 quantity) public virtual;

    function storage_safeMint(
        address msgSender,
        address to,
        uint256 quantity,
        bytes memory _data
    ) public virtual;

    function storage_mint(address msgSender, address to, uint256 quantity) public virtual;

    function storage_contractURI(address collection) public view virtual returns (string memory);
}

////////////////////////////////////////




















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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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



// 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);
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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: @openzeppelin/contracts/token/ERC20/IERC20.sol



// 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);
}

// 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/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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`.
     *
     * 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;

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

    /**
     * @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);
}

// 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/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/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/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);
}