For words that have only three letters, there isn't a 4th letter. For instance with the word “increase”, there won't be any more letters afterwards and thus must be the word "incorporate". The word “addict” is within the BIP39 wordlist but you would've utilized “addi” for “addict”. You ought to https://socialistener.com/story4276304/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting