I took the index on the words, transformed the variety to binary, additional three zeros, calculated the sha256 digest, took the first Element of the hexadecimal to transform it to binary, additional a few zeros into the eight digits in the binary and got 00000010011 which interprets to 19 in https://thebookmarkfree.com/story19729272/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition