Bip39 Word List Numbers. All information these cookies accumulate is aggregated and so anonymous. If you do not enable these cookies and scripts, we is not going to know When you've got visited our site. For words that only have 3 letters, there isn't any 4th letter. One example is https://directory-nation.com/listings13379866/bip39-npm-https-linktr-ee-bip39-the-greatest-guide-to-bip39-checksum