I took the index with the words, converted the quantity to binary, additional a few zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to transform it to binary, additional a few zeros to the 8 digits in the binary and acquired 00000010011 which translates to 19 https://yoursocialpeople.com/story5004002/facts-about-bip39-seed-phrase-github-revealed