I took the index on the words, transformed the range to binary, included a few zeros, calculated the sha256 digest, took the first Section of the hexadecimal to convert it to binary, included three zeros to the 8 digits in the binary and acquired 00000010011 which translates to 19 in https://sociallytraffic.com/story3750039/the-definitive-guide-to-bip39-seed-phrase