I took the index in the words, converted the range to binary, included a few zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, additional a few zeros for the 8 digits with the binary and received 00000010011 which translates to 19 https://www.tumblr.com/generalllamacolor/772952501127380992/opening-the-globe-of-bip39-a-comprehensive-guide