Bip39 entropy https://500px.com/p/alexzhiglatyxrnxb The final move of BIP-39 is creating the actual binary seed which can be then employed being a grasp important in BIP-32 deterministic wallet or applying other methods. For words that have only 3 letters, there isn't any 4th letter. As an example Using the word “increase”, https://bookmarkoffire.com/story20523288/bip39-online-the-single-best-strategy-to-use-for-bip39-word-list-pdf-https-x-com-tundra838554