I took the index from the words, transformed the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the very first Component of the hexadecimal to transform it to binary, extra 3 zeros on the eight digits with the binary and obtained 00000010011 which interprets to 19 in https://zbookmarkhub.com/story19037265/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition