I took the index on the words, converted the number to binary, included a few zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to convert it to binary, additional 3 zeros towards the 8 digits in the binary and bought 00000010011 which interprets to 19 in https://bookmarkbooth.com/story18822319/top-guidelines-of-bip39-word-list-pdf