Bip39 rules https://go.bubbl.us/ebe220/f17a?/Bookmarks Even though it makes use of BIP32 system it is possible to however import BIP39 seeds into Electrum wallet. Also aside from BIp32 There's BIP44 version which some wallet use to the generation of seeds. Compared with standard wallets derived only from a seed phrase, passphrase-protected wallets https://bookmarkmiracle.com/story22270313/bip39-protocol-bip39-converter-an-overview-https-cutt-ly-uryc5rw7