I took the index from the words, transformed the range to binary, extra a few zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to transform it to binary, additional 3 zeros to the 8 digits with the binary and obtained 00000010011 which translates to 19 in https://throbsocial.com/story20874114/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition