I took the index on the words, transformed the number to binary, extra three zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to convert it to binary, additional 3 zeros to your eight digits in the binary and bought 00000010011 which interprets to 19 in decimal. https://mysterybookmarks.com/story18777642/little-known-facts-about-bip39-seed-phrase-list