I took the index in the words, converted the amount to binary, additional three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to convert it to binary, additional 3 zeros for the 8 digits from the binary and received 00000010011 which translates to 19 in decimal. https://hylistings.com/story20088397/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting