For words that have only 3 letters, there is no 4th letter. For instance with the word “insert”, there won't be any a lot more letters Later on and so needs to be the word "insert". The word “addict” is from the BIP39 wordlist however you would've utilized “addi” for https://yxzbookmarks.com/story18788586/new-step-by-step-map-for-bip39-english-words