For words that have only three letters, there's no 4th letter. For instance with the word “increase”, there isn't any far more letters Later on and thus has to be the word "include". The word “addict” is from the BIP39 wordlist however you might have made use of “addi” for https://meshbookmarks.com/story19011032/the-ultimate-guide-to-bip39-seed-phrase-github