For words that have only three letters, there isn't a 4th letter. As an example with the word “add”, there won't be any a lot more letters afterwards and so have to be the word "add". The word “addict” is from the BIP39 wordlist however you would've utilized “addi” for https://bookmarkboom.com/story18798909/the-basic-principles-of-bip39-passphrase-generator