For words that only have 3 letters, there isn't a 4th letter. By way of example with the word “add”, there won't be any much more letters Later on and therefore has to be the word "insert". The word “addict” is while in the BIP39 wordlist but you would've made https://bookmarksystem.com/story18692598/5-simple-techniques-for-bip39-seed-phrase