Bip39 protocol https://list.ly/abregeouoh Checksum generation: A checksum is created from this entropy employing SHA-256 hashing, which allows verify the mnemonic's integrity later on. For words that have only 3 letters, there is not any 4th letter. By way of example Along with the word “insert”, there aren't any additional letters https://allkindsofsocial.com/story5857364/bip39-eth-not-known-details-about-bip39-word-list-txt-https-x-com-tundra838554