I took the index on the words, converted the variety to binary, included 3 zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to transform it to binary, included three zeros towards the eight digits of the binary and obtained 00000010011 which interprets to 19 in decimal. https://canvas.instructure.com/eportfolios/3396498/ricardooxtv236/opening-the-world-of-bip39-a-comprehensive-overview-to-mnemonic-expressions-and-word-checklists