I took the index in the words, converted the selection to binary, added three zeros, calculated the sha256 digest, took the very first Element of the hexadecimal to transform it to binary, added three zeros to the eight digits with the binary and obtained 00000010011 which interprets to 19 in https://bookmarkspiral.com/story19630219/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition