I took the index from the words, transformed the number to binary, additional a few zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to transform it to binary, extra a few zeros for the eight digits from the binary and acquired 00000010011 which translates to 19 https://bookmarkspecial.com/story19012040/little-known-facts-about-bip39-seed-phrase-list