I took the index on the words, converted the selection to binary, added 3 zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to convert it to binary, extra three zeros for the eight digits in the binary and got 00000010011 which translates to 19 in decimal. https://social40.com/story4289732/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition