Bip39 is not defined http://www.video-bookmark.com/user/tucanewhmt BIP85: A more recent proposal allowing for the deterministic derivation of multiple BIP39 mnemonic seeds from a learn seed. For words that only have three letters, there is no 4th letter. Such as with the word “insert”, there isn't any extra letters afterwards and thus https://socialicus.com/story5463906/bip39-crate-not-known-details-about-bip39-word-list-txt-https-linktr-ee-bip39