Bip39 how it works https://franciscougju442.bravesites.com/entries/general/Produce-Bitcoin-Addresses-from-Seed-Every-Little-Thing-You-Required-to-Know Regardless that it uses BIP32 process you'll be able to however import BIP39 seeds into Electrum wallet. Also other than BIp32 There exists BIP44 version which some wallet use with the era of seeds. For words that only have three letter... https://writeablog.net/ipennywpzc/the-ultimate-overview-to-offline-bip39-generators-remain-secure