Bip39 12 vs 24 http://www.mediafire.com/file/uilrjfajg2ami24/pdf-14673-57158.pdf Even though it takes advantage of BIP32 system you can nevertheless import BIP39 seeds into Electrum wallet. Also besides BIp32 there is BIP44 version which some wallet use to the generation of seeds. Want to examine which wallets help the BIP39 mnemonic recovery seed phrase? https://pukkabookmarks.com/story20681806/bip39-checksum-calculator-new-step-by-step-map-for-bip39-github-https-cutt-ly-uryc5rw7