I took the index from the words, converted the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the first Component of the hexadecimal to convert it to binary, added 3 zeros on the eight digits from the binary and received 00000010011 which translates to 19 in decimal. https://freshbookmarking.com/story18875476/facts-about-bip39-seed-phrase-github-revealed