For words that have only three letters, there isn't any 4th letter. By way of example with the word “add”, there won't be any a lot more letters Later on and therefore have to be the word "include". The word “addict” is during the BIP39 wordlist however, you would have https://reallivesocial.com/story4458569/considerations-to-know-about-bip39-word-list-pdf