Bip39 is not defined https://500px.com/p/alexzhiglatyxrnxb BIP85: A more recent proposal allowing for the deterministic derivation of a number of BIP39 mnemonic seeds from a grasp seed. For words that have only three letters, there's no 4th letter. One example is With all the word “insert”, there isn't any much more https://bookmarks-hit.com/story23468309/bip39-word-finder-helping-the-others-realize-the-advantages-of-bip39-passphrase-https-linktr-ee-bip39