Bip39 blockchain https://josueaqpi312.huicopper.com/leading-5-online-bip39-generators-for-easy-copyright-security Although it employs BIP32 system you'll be able to nevertheless import BIP39 seeds into Electrum wallet. Also in addition to BIp32 there is BIP44 Model which some wallet use for that generation of seeds. For words that have only three letters, there is no 4th letter. For https://directmysocial.com/story5520708/bip39-python-bip39-generator-secrets-https-cutt-ly-uryc5rw7