Bip39 full list https://marioqxzy082.raidersfanteamshop.com/comprehending-the-function-of-bip39-in-copyright-pocketbooks Though it takes advantage of BIP32 method you may however import BIP39 seeds into Electrum wallet. Also apart from BIp32 You can find BIP44 version which some wallet use for your technology of seeds. For words that have only 3 letters, there isn't any 4th letter. https://naturalbookmarks.com/story20198538/bip39-standalone-html-the-greatest-guide-to-bip39-https-t-me-bip39-chat