I took the index from the words, converted the range to binary, additional a few zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to transform it to binary, additional three zeros on the 8 digits from the binary and received 00000010011 which translates to 19 http://rylanmecp341.wpsuo.com/from-words-to-wide-range-exactly-how-to-efficiently-make-use-of-bip39-passphrases-for-your-copyright-pocketbooks