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