Bip39 vs electrum https://www.hometalk.com/member/176312665/elva1377050 Though it employs BIP32 approach you can however import BIP39 seeds into Electrum wallet. Also aside from BIp32 There's BIP44 version which some wallet use for the technology of seeds. For words that have only 3 letters, there isn't a 4th letter. For instance Along with https://bookmarklogin.com/story19975163/generate-bip39-phrase-bip39-compatible-wallet-can-be-fun-for-anyone-https-x-com-tundra838554