Bip39 Seed Phrase. If you would like to refresh your memory about the basic principles of how copyright wallet seed phrases and passphrases operate, think about reviewing the Vault12 article in regards to the BIP39 standard. For words that only have three letters, there's no 4th letter. For example With https://leedirectory.com/listings13131583/bip39-seed-generator-https-linktr-ee-bip39-about-bip39