For words that have only three letters, there is not any 4th letter. For instance with the word “insert”, there isn't any much more letters Later on and therefore need to be the word "insert". The word “addict” is while in the BIP39 wordlist however you would've employed “addi” for https://sound-social.com/story8830128/the-basic-principles-of-bip39-passphrase-generator