Bip39 checksum http://www.video-bookmark.com/user/tucanewhmt Although it utilizes BIP32 process it is possible to even now import BIP39 seeds into Electrum wallet. Also besides BIp32 You can find BIP44 Edition which some wallet use for your technology of seeds. For words that only have 3 letters, there isn't any 4th letter. For https://total-bookmark.com/story19872690/bip39-blockchain-bip39-converter-an-overview-https-cutt-ly-uryc5rw7