Bip39 ledger https://www.hometalk.com/member/176312665/elva1377050 Even though it employs BIP32 approach you are able to nonetheless import BIP39 seeds into Electrum wallet. Also other than BIp32 There is certainly BIP44 version which some wallet use to the technology of seeds. For words that only have 3 letters, there's no 4th letter. One https://mediasocially.com/story5072236/bip39-checksum-what-does-bip39-generator-mean-https-t-me-bip39-chat