For words that have only 3 letters, there's no 4th letter. One example is with the word “include”, there isn't any a lot more letters Later on and thus needs to be the word "increase". The word “addict” is inside the BIP39 wordlist however , you would have applied “addi” https://classifylist.com/story21440963/bip39-phrase-generator-can-be-fun-for-anyone