I took the index of the words, transformed the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to convert it to binary, included three zeros to the 8 digits with the binary and got 00000010011 which translates to 19 in decimal. https://letsbookmarkit.com/story18992754/new-step-by-step-map-for-bip39-english-words