For words that only have three letters, there isn't a 4th letter. One example is with the word “increase”, there aren't any much more letters Later on and thus must be the word "increase". The word “addict” is while in the BIP39 wordlist however , you would've used “addi” for https://throbsocial.com/story21399493/facts-about-bip39-seed-phrase-github-revealed