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# Open Zeppelin Contracts
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This is a sample project of [OpenZeppelin contracts](https://openzeppelin.com/contracts/).
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## Smart Contracts
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- **contracts/GLDToken.sol**: a smart contract implements [ERC-20](https://docs.openzeppelin.com/contracts/4.x/erc20).
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- **contracts/GameItem.sol**: a smart contract implements [ERC-721](https://docs.openzeppelin.com/contracts/4.x/erc721).
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- **contracts/GameItems.sol**: a smart contract implements [ERC-1155](https://docs.openzeppelin.com/contracts/4.x/erc1155).
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## Reference
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- GitHub: https://github.com/OpenZeppelin/openzeppelin-contracts
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- Documentation: https://docs.openzeppelin.com/contracts
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npm install @openzeppelin/contracts
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truffle-flattener contracts/ShuiJing.sol > ShuiJing.sol
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