Bip39 format https://www.4shared.com/s/fAf7kF4dLku Although it makes use of BIP32 process it is possible to even now import BIP39 seeds into Electrum wallet. Also other than BIp32 There's BIP44 Model which some wallet use for that era of seeds. For words that only have 3 letters, there is no 4th letter. https://socialmediainuk.com/story23009082/bip39-ian-coleman-5-tips-about-bip39-checksum-you-can-use-today-https-dzen-ru-bip39-phrase-com