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RE: Steemit Crypto Academy Season 2: Week4| TOKENS, PARTE 2: ERC-20 y ERC-721, by @pelon53
Hi professor, please check my homework
https://steemit.com/hive-108451/@diegopreman/crypto-academy-week-12-homework-post-for-pelon53-tokens-part-2-erc-20-and-erc-721