I took the index in the words, converted the variety to binary, extra 3 zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, additional 3 zeros for the eight digits of the binary and got 00000010011 which interprets to 19 in decimal. https://geniusbookmarks.com/story18858377/facts-about-bip39-seed-phrase-github-revealed