Bip 39 github https://list.ly/abregeouoh Regardless that it works by using BIP32 approach it is possible to still import BIP39 seeds into Electrum wallet. Also besides BIp32 There may be BIP44 Variation which some wallet use for your generation of seeds. Exactly how much stability does a passphrase insert? A BIP39 https://thesocialdelight.com/story5790119/bip39-combinations-the-5-second-trick-for-bip39-compatible-wallet-https-dzen-ru-bip39-phrase-com