Bip39 c++ https://marioqxzy082.raidersfanteamshop.com/comprehending-the-function-of-bip39-in-copyright-pocketbooks Despite the fact that it utilizes BIP32 process you may continue to import BIP39 seeds into Electrum wallet. Also other than BIp32 There may be BIP44 Edition which some wallet use for that era of seeds. For words that have only 3 letters, there's no 4th letter. https://socialwoot.com/story21792536/bip39-converter-bip39-passphrase-generator-options-https-x-com-tundra838554