I took the index of your words, converted the selection to binary, additional three zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, additional a few zeros on the 8 digits of the binary and acquired 00000010011 which translates to 19 in https://zenwriting.net/keenanctdp/h1-b-unlocking-the-power-of-bip39-a-comprehensive-look-at-word-lists-and