For words that only have three letters, there is not any 4th letter. Such as with the word “insert”, there aren't any extra letters Later on and so have to be the word "include". The word “addict” is during the BIP39 wordlist however , you would have applied “addi” for https://bookmarkshq.com/story20316447/the-basic-principles-of-bip39-passphrase-generator