For words that only have three letters, there isn't any 4th letter. For example with the word “add”, there isn't any extra letters Later on and so have to be the word "incorporate". The word “addict” is while in the BIP39 wordlist however , you would have employed “addi” for https://hyperbookmarks.com/story19465480/5-simple-techniques-for-bip39-word-list-pdf