Bip39 rust https://go.bubbl.us/ebe220/f17a?/Bookmarks Implementations like SLIP39 lengthen BIP39's abilities by splitting seed phrases into various shares, requiring a predefined threshold of shares to reconstruct the initial seed. This method enhances safety by reducing one details of failure. For words that have only three letters, there is absolutely no 4th letter. https://jsbin.com/titaniseko