I took the index of the words, transformed the variety to binary, included three zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to convert it to binary, added 3 zeros to the 8 digits of your binary and received 00000010011 which translates to 19 in decimal. https://artybookmarks.com/story18725663/the-2-minute-rule-for-bip39-all-words