For words that have only three letters, there isn't any 4th letter. By way of example with the word “include”, there aren't any far more letters Later on and so have to be the word "incorporate". The word “addict” is inside the BIP39 wordlist however you might have employed “addi” https://livebookmarking.com/story19010090/5-simple-techniques-for-bip39-seed-phrase