Unknown bip39 wordlist https://go.bubbl.us/ebe220/f17a?/Bookmarks Though it employs BIP32 strategy it is possible to nevertheless import BIP39 seeds into Electrum wallet. Also aside from BIp32 There's BIP44 Variation which some wallet use with the generation of seeds. For words that only have 3 letters, there is no 4th letter. One example https://felixkkjt585.theglensecret.com/bip39-word-checklist-generator-crafting-your-own-special-seed-phrase