I took the index on the words, transformed the variety to binary, included a few zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, included a few zeros to the eight digits of your binary and obtained 00000010011 which translates to 19 https://bookmarkshome.com/story4538357/5-simple-techniques-for-bip39-word-list-pdf