I took the index of the words, converted the range to binary, extra 3 zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to transform it to binary, included a few zeros into the eight digits of the binary and received 00000010011 which translates to 19 in https://socialskates.com/story19943667/facts-about-bip39-seed-phrase-github-revealed