Bip39 format example https://www.giantbomb.com/profile/blathayqvn/ Regardless that it employs BIP32 system you can even now import BIP39 seeds into Electrum wallet. Also besides BIp32 There may be BIP44 version which some wallet use for the era of seeds. For words that only have three letters, there is no 4th letter. For https://expressbookmark.com/story20821357/bip39-chinese-the-5-second-trick-for-bip39-mnemonic-code-converter-tool-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw