For words that have only three letters, there isn't a 4th letter. One example is with the word “insert”, there won't be any a lot more letters Later on and therefore has to be the word "include". The word “addict” is from the BIP39 wordlist however, you would've utilized “addi” https://mysocialguides.com/story4902620/top-guidelines-of-bip39-word-list-pdf