I took the index with the words, converted the variety to binary, added 3 zeros, calculated the sha256 digest, took the main Section of the hexadecimal to transform it to binary, additional three zeros to your 8 digits in the binary and got 00000010011 which translates to 19 in decimal. https://squareblogs.net/edelinepge/h1-b-recognizing-bip39-a-comprehensive-overview-to-mnemonic-expressions-and