Bip39 offline https://www.divephotoguide.com/user/arwyneglmp/ Regardless that it makes use of BIP32 method you may nevertheless import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There may be BIP44 Model which some wallet use for that generation of seeds. For words that have only three letters, there isn't a 4th https://andersonsaeu988.iamarrows.com/bip39-generator-online-the-best-devices-for-secure-wallet-creation