I took the index from the words, transformed the range to binary, included a few zeros, calculated the sha256 digest, took the first part of the hexadecimal to convert it to binary, added a few zeros to the eight digits of your binary and bought 00000010011 which interprets to 19 https://ilovebookmarking.com/story18905762/top-guidelines-of-bip39-word-list-pdf