Bip39 Wallet. If you would like to refresh your memory about the basics of how copyright wallet seed phrases and passphrases operate, think about examining the Vault12 posting about the BIP39 standard. For words that only have three letters, there isn't any 4th letter. One example is with the word https://webdirectory777.com/listings13072664/bip39-npm-https-linktr-ee-bip39-5-simple-statements-about-bip39-compatible-wallet-explained