Bip39 is not defined https://felixkkjt585.theglensecret.com/bip39-word-checklist-generator-crafting-your-own-special-seed-phrase Though it takes advantage of BIP32 system you are able to continue to import BIP39 seeds into Electrum wallet. Also apart from BIp32 There exists BIP44 Variation which some wallet use for that technology of seeds. Because of the cryptographic design of BIP-3... https://t.me/BIP39_CHAT