I took the index on the words, transformed the amount to binary, extra 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, added 3 zeros into the 8 digits of your binary and acquired 00000010011 which translates to 19 in decimal. https://tinybookmarks.com/story18793044/the-invalid-bip39-phrase-diaries