I took the index with the words, transformed the range to binary, included three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, extra a few zeros for the 8 digits of your binary and acquired 00000010011 which translates to 19 in https://hylistings.com/story19972132/little-known-facts-about-bip39-seed-phrase-list