Bip39 protocol https://ameblo.jp/generate-bip39brooks/entry-12913353546.html The final action of BIP-39 is producing the particular binary seed and that is then applied for a learn vital in BIP-32 deterministic wallet or employing other procedures. For words that have only 3 letters, there isn't any 4th letter. By way of example with the word https://bookmarksurl.com/story5558680/bip39-split-mnemonic-new-step-by-step-map-for-bip39-github-https-dzen-ru-bip39-phrase-com