Bip39 phrase https://rentry.co/p68weyby Although it employs BIP32 method you may nevertheless import BIP39 seeds into Electrum wallet. Also other than BIp32 You can find BIP44 Variation which some wallet use with the technology of seeds. For words that only have 3 letters, there is no 4th letter. As an example https://tvsocialnews.com/story6085670/bip39-how-it-works-the-single-best-strategy-to-use-for-bip39-recovery-tool-https-x-com-tundra838554