Bip39 format https://www.bitsdujour.com/profiles/wWbptt BIP85: A more moderen proposal allowing the deterministic derivation of multiple BIP39 mnemonic seeds from the learn seed. For words that only have 3 letters, there isn't any 4th letter. One example is with the word “incorporate”, there aren't any far more letters Later on and so https://bookmark-template.com/story25699713/bip39-onekey-bip39-checksum-an-overview-https-dzen-ru-bip39-phrase-com