I took the index on the words, transformed the amount to binary, included a few zeros, calculated the sha256 digest, took the very first Component of the hexadecimal to convert it to binary, added three zeros to the 8 digits with the binary and obtained 00000010011 which translates to 19 https://get-social-now.com/story4859561/bip39-seed-phrase-mnemonics-generator-an-overview