For words that have only three letters, there is absolutely no 4th letter. By way of example with the word “include”, there are no far more letters Later on and thus must be the word "insert". The word “addict” is while in the BIP39 wordlist however , you might have https://dmozbookmark.com/story19631535/the-5-second-trick-for-ledger-seed-phrase-bip39