Bip39 decoder https://josuejnub341.image-perth.org/the-future-of-copyright-security-why-bip39-issues-for-every-person Although it makes use of BIP32 approach you could continue to import BIP39 seeds into Electrum wallet. Also other than BIp32 there is BIP44 version which some wallet use for the generation of seeds. For words that have only 3 letters, there isn't any 4th letter. For https://friendlybookmark.com/story20491234/bip39-generator-with-balance-the-single-best-strategy-to-use-for-bip39-word-list-pdf-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw