I took the index of your words, converted the variety to binary, added 3 zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, included three zeros on the eight digits of the binary and received 00000010011 which interprets to 19 in https://mirrorbookmarks.com/story19536111/considerations-to-know-about-bip39-word-list-pdf