Bip39 Online. If you would like to refresh your memory about the basics of how copyright wallet seed phrases and passphrases perform, take into consideration reviewing the Vault12 posting in regards to the BIP39 standard. For words that have only 3 letters, there isn't a 4th letter. As an example https://pageupdirectory.com/listings13051202/bip39-seed-https-linktr-ee-bip39-top-bip39-seed-phrase-secrets