I took the index on the words, transformed the number to binary, additional three zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to transform it to binary, included a few zeros for the eight digits of your binary and got 00000010011 which translates to 19 in https://nowbookmarks.com/story19505585/the-2-minute-rule-for-bip39-all-words