For words that only have 3 letters, there's no 4th letter. For example with the word “include”, there isn't any much more letters Later on and therefore should be the word "insert". The word “addict” is during the BIP39 wordlist however , you would have used “addi” for “addict”. Retailer https://seobookmarkpro.com/story18836566/a-review-of-bip39-passphrase