I took the index from the words, transformed the quantity to binary, extra a few zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to transform it to binary, additional 3 zeros for the eight digits of your binary and received 00000010011 which translates to 19 http://jaspermuxp089.yousher.com/from-mnemonics-to-security-comprehending-bip39-passphrases-and-their-significance-in-copyright