For words that have only three letters, there's no 4th letter. One example is with the word “incorporate”, there isn't any extra letters afterwards and so has to be the word "increase". The word “addict” is while in the BIP39 wordlist however, you would've employed “addi” for “addict”. By subsequent https://onelifesocial.com/story4134183/a-review-of-bip39-passphrase