I took the index on the words, transformed the number to binary, additional 3 zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to convert it to binary, added 3 zeros to your eight digits of the binary and received 00000010011 which translates to 19 in decimal. https://bookmarkshome.com/story4551459/5-simple-techniques-for-bip39-word-list-pdf