I took the index in the words, converted the selection to binary, additional three zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to convert it to binary, extra a few zeros for the 8 digits on the binary and received 00000010011 which translates to 19 in https://nowbookmarks.com/story19055288/the-2-minute-rule-for-bip39-all-words