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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
pragma abicoder v2; // required to accept structs as function parameters | |
//truffle | |
//npm install @openzeppelin/contracts@3.4.0 | |
import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; | |
import "@openzeppelin/contracts/access/Ownable.sol"; |