There's already a word blacklist, but it's very bad. Make it so there's a whitelist, for example, the blacklist would detect a post first, and see that it has a bad word. After that, it uses the whitelist to see there's really a bad word. By whitelist, I don't mean make it so there's only a selection of words you can use only, but rather you can type any word, then the whitelist will detect the words that the blacklist detected. It will see if it's really bad, it will check from the database. After that, it will finish.

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