I took the index from the words, converted the amount to binary, additional three zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to transform it to binary, extra 3 zeros on the eight digits of your binary and got 00000010011 which translates to 19 in decimal. https://socialmphl.com/story20819193/little-known-facts-about-bip39-seed-phrase-list