Bip39 documentation https://rentry.co/p68weyby BIP85: A more moderen proposal enabling the deterministic derivation of several BIP39 mnemonic seeds from a learn seed. For words that only have three letters, there is absolutely no 4th letter. One example is Using the word “increase”, there aren't any extra letters afterwards and thus have https://gravatar.com/sparklyusually6089a4f337