Bip39 dot map https://edgargvkh682.theburnward.com/a-novice-s-overview-to-getting-a-bip39-mnemonic-expression While it takes advantage of BIP32 system you could even now import BIP39 seeds into Electrum wallet. Also aside from BIp32 there is BIP44 version which some wallet use with the technology of seeds. How much stability does a passphrase increase? A BIP39 passphrase substantially... https://bookmark-vip.com/story20591261/bip39-validator-new-step-by-step-map-for-bip39-github-https-dzen-ru-bip39-phrase-com