I took the index of your words, transformed the range to binary, extra 3 zeros, calculated the sha256 digest, took the primary Section of the hexadecimal to convert it to binary, added three zeros towards the 8 digits from the binary and received 00000010011 which translates to 19 in decimal. https://socialioapp.com/story4441795/facts-about-bip39-seed-phrase-word-list-revealed