I took the index from the words, transformed the number to binary, included 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, added 3 zeros to your eight digits from the binary and obtained 00000010011 which translates to 19 in decimal. https://setbookmarks.com/story19068121/not-known-facts-about-bip39-english-words