I took the index on the words, transformed the quantity to binary, additional a few zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to convert it to binary, added three zeros on the 8 digits with the binary and acquired 00000010011 which translates to 19 in https://bookmarkfavors.com/story5059597/facts-about-bip39-seed-phrase-github-revealed