I took the index of your words, converted the number to binary, extra three zeros, calculated the sha256 digest, took the 1st Section of the hexadecimal to convert it to binary, included 3 zeros to the eight digits of the binary and received 00000010011 which interprets to 19 in decimal. http://jaspermuxp089.yousher.com/from-mnemonics-to-security-comprehending-bip39-passphrases-and-their-significance-in-copyright