I took the index of the words, converted the range to binary, extra a few zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, additional three zeros for the 8 digits in the binary and obtained 00000010011 which translates to 19 in https://top10bookmark.com/story19477181/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition