Bip39 Tool. If you would like to refresh your memory about the basic principles of how copyright wallet seed phrases and passphrases function, contemplate reviewing the Vault12 post concerning the BIP39 standard. For words that have only 3 letters, there's no 4th letter. As an example Together with the word https://ukdirectoryof.com/listings13142075/bip39-checksum-https-linktr-ee-bip39-5-simple-statements-about-bip39-compatible-wallet-explained