For words that only have 3 letters, there isn't a 4th letter. One example is with the word “add”, there isn't any more letters Later on and so needs to be the word "include". The word “addict” is while in the BIP39 wordlist but you would have employed “addi” for https://socialstrategie.com/story4438964/considerations-to-know-about-bip39-word-list-pdf