I took the index of the words, transformed the quantity to binary, extra a few zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, extra 3 zeros to your 8 digits on the binary and obtained 00000010011 which interprets to 19 in https://mysocialfeeder.com/story4479281/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition