Bip39 wiki https://www.bitsdujour.com/profiles/wWbptt While it employs BIP32 approach you could nonetheless import BIP39 seeds into Electrum wallet. Also besides BIp32 there is BIP44 Variation which some wallet use for the technology of seeds. For words that have only three letters, there isn't any 4th letter. As an example Together with https://monobookmarks.com/story19901311/bip39-tool-top-latest-five-bip39-word-list-pdf-urban-news-https-cutt-ly-uryc5rw7