Bip39 Ian Coleman. We use data collected by way of cookies and very similar systems to improve your practical experience on our site, analyse how you utilize it and for marketing and advertising reasons. For words that only have 3 letters, there isn't a 4th letter. For example While using https://phrasedirectory.com/listings13052271/bip39-seed-generator-https-linktr-ee-bip39-5-tips-about-bip39-python-you-can-use-today