I took the index of your words, converted the number to binary, added three zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, extra 3 zeros to the 8 digits with the binary and received 00000010011 which translates to 19 in decimal. https://onelifesocial.com/story4180271/the-definitive-guide-to-bip39-seed-phrase