I took the index from the words, converted the amount to binary, added three zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, included 3 zeros to the eight digits with the binary and received 00000010011 which translates to 19 in decimal. https://baidubookmark.com/story18692805/considerations-to-know-about-bip39-seed-phrase-generator