For words that only have three letters, there isn't a 4th letter. As an example with the word “include”, there are no much more letters afterwards and thus need to be the word "include". The word “addict” is within the BIP39 wordlist however, you would've utilized “addi” for “addict”. gravity https://geilebookmarks.com/story18884105/5-essential-elements-for-bip39-explained