I took the index on the words, transformed the selection to binary, extra three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, additional three zeros towards the 8 digits with the binary and received 00000010011 which translates to 19 in https://www.storeboard.com/blogs/beauty-and-fashion/opening-the-globe-of-bip39-a-comprehensive-guide-to-mnemonic-expressions-and-word-checklists/6026188