I took the index of your words, converted the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, extra 3 zeros into the eight digits from the binary and acquired 00000010011 which translates to 19 in decimal. https://sirketlist.com/story20470848/top-guidelines-of-bip39-word-list-pdf