I took the index in the words, converted the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to convert it to binary, additional a few zeros to the 8 digits of your binary and obtained 00000010011 which translates to 19 in https://toplistar.com/story20890969/top-guidelines-of-bip39-word-list-pdf