I took the index on the words, transformed the range to binary, added 3 zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to convert it to binary, extra 3 zeros into the eight digits with the binary and got 00000010011 which translates to 19 in decimal. https://bouchesocial.com/story20804807/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-seed-phrase-mnemonics-generator