For words that have only 3 letters, there isn't any 4th letter. One example is with the word “include”, there won't be any much more letters afterwards and thus need to be the word "increase". The word “addict” is during the BIP39 wordlist however, you would have utilised “addi” for https://gorillasocialwork.com/story20471319/the-ultimate-guide-to-bip39-seed-phrase-github