I took the index on the words, transformed the number to binary, extra 3 zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, extra three zeros to your 8 digits in the binary and received 00000010011 which translates to 19 in decimal. https://adsbookmark.com/story18987193/examine-this-report-on-bip39-passphrase