I took the index from the words, converted the quantity to binary, added 3 zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to convert it to binary, extra three zeros to your 8 digits of the binary and bought 00000010011 which interprets to 19 in decimal. https://mediajx.com/story21904998/considerations-to-know-about-bip39-word-list-pdf