Bip39 python https://zenwriting.net/keenanctdp/how-to-create-a-bip39-seed-a-step-by-step-guide Regardless that it uses BIP32 method you are able to still import BIP39 seeds into Electrum wallet. Also besides BIp32 You can find BIP44 Variation which some wallet use for that generation of seeds. For words that only have 3 letters, there's no 4th letter. By way https://thebookpage.com/story5675619/bip39-key-bip39-npm-no-further-a-mystery-https-dzen-ru-bip39-phrase-com