I took the index of the words, converted the selection to binary, additional three zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to convert it to binary, extra a few zeros for the eight digits with the binary and received 00000010011 which interprets to 19 in https://bookmarkspedia.com/story5051182/how-much-you-need-to-expect-you-ll-pay-for-a-good-valid-bip39-seed-phrase