Bip39 rules https://felixkkjt585.theglensecret.com/bip39-word-checklist-generator-crafting-your-own-special-seed-phrase While it employs BIP32 process you may however import BIP39 seeds into Electrum wallet. Also aside from BIp32 There's BIP44 Variation which some wallet use to the technology of seeds. BIP39 solves this through the use of human-readable seed phrases composed of normal... https://postheaven.net/tiablexcen/recognizing-the-duty-of-bip39-in-copyright-budgets