I took the index with the words, transformed the number to binary, added a few zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to convert it to binary, additional three zeros towards the 8 digits with the binary and received 00000010011 which translates to 19 in https://networkbookmarks.com/story18822041/5-simple-techniques-for-bip39-word-list-pdf