I took the index from the words, converted the amount to binary, extra three zeros, calculated the sha256 digest, took the main part of the hexadecimal to transform it to binary, additional three zeros for the eight digits of your binary and bought 00000010011 which translates to 19 in decimal. https://tbookmark.com/story18699328/considerations-to-know-about-bip39-seed-phrase-generator