Adesivo bip 39 https://unsplash.com/@morganvmyg Even though it works by using BIP32 approach you can still import BIP39 seeds into Electrum wallet. Also in addition to BIp32 there is BIP44 version which some wallet use for your generation of seeds. For words that only have three letters, there's no 4th letter. https://postheaven.net/tiablexcen/recognizing-the-duty-of-bip39-in-copyright-budgets