Bip39 binary https://papaly.com/1/eMEf BIP85: A more recent proposal permitting the deterministic derivation of multiple BIP39 mnemonic seeds from the learn seed. For words that have only 3 letters, there isn't a 4th letter. As an example Using the word “increase”, there won't be any much more letters Later on and https://mariobrpx591.cavandoragh.org/getting-a-bip39-phrase-in-python-a-comprehensive-tutorial