I took the index in the words, transformed the selection to binary, included a few zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to transform it to binary, added three zeros on the eight digits from the binary and received 00000010011 which translates to 19 in https://maroonbookmarks.com/story18715977/facts-about-bip39-seed-phrase-github-revealed