For words that only have three letters, there's no 4th letter. For example with the word “insert”, there aren't any additional letters afterwards and so need to be the word "include". The word “addict” is in the BIP39 wordlist however, you would've utilized “addi” for “addict”. In this manner, we https://ilovebookmark.com/story18700298/a-secret-weapon-for-bip39-words-to-numbers