I took the index in the words, converted the amount to binary, extra a few zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, included three zeros to the eight digits on the binary and acquired 00000010011 which translates to 19 in https://seolistlinks.com/story20155120/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator