I took the index with the words, transformed the variety to binary, included a few zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, added three zeros towards the eight digits of your binary and received 00000010011 which interprets to 19 in https://myfirstbookmark.com/story18932570/5-simple-techniques-for-bip39-word-list-pdf