I took the index of your words, converted the variety to binary, extra three zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to convert it to binary, included a few zeros on the 8 digits of the binary and acquired 00000010011 which interprets to 19 in https://canvas.instructure.com/eportfolios/3396498/ricardooxtv236/opening-the-world-of-bip39-a-comprehensive-overview-to-mnemonic-expressions-and-word-checklists