For words that have only three letters, there's no 4th letter. By way of example with the word “add”, there won't be any much more letters Later on and so must be the word "add". The word “addict” is during the BIP39 wordlist however you might have utilized “addi” for https://userbookmark.com/story18767638/considerations-to-know-about-bip39-word-list-pdf