I took the index on the words, transformed the range to binary, additional 3 zeros, calculated the sha256 digest, took the main part of the hexadecimal to transform it to binary, included a few zeros on the 8 digits of your binary and acquired 00000010011 which translates to 19 in https://nybookmark.com/story20409107/new-step-by-step-map-for-bip39-english-words