I took the index on the words, transformed the range to binary, extra 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to convert it to binary, added three zeros to the 8 digits from the binary and got 00000010011 which translates to 19 in decimal. https://allkindsofsocial.com/story4234061/the-greatest-guide-to-seed-phrase-bip39