I took the index from the words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the 1st Section of the hexadecimal to convert it to binary, included a few zeros to the eight digits of the binary and received 00000010011 which translates to 19 in https://top100bookmark.com/story19311471/facts-about-bip39-seed-phrase-github-revealed