Bip39 c++ https://blogfreely.net/travenmdoq/create-your-own-distinct-bip39-mnemonic-expression-with-python-scripts The last phase of BIP-39 is making the particular binary seed that is then made use of as a master important in BIP-32 deterministic wallet or using other solutions. For words that have only 3 letters, there isn't any 4th letter. For example with the word “incorporate”, https://pr7bookmark.com/story20876698/bip39-wallet-app-the-5-second-trick-for-bip39-compatible-wallet-https-dzen-ru-bip39-phrase-com