I took the index in the words, converted the quantity to binary, added three zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to convert it to binary, extra three zeros for the 8 digits on the binary and acquired 00000010011 which translates to 19 in decimal. https://bookmarksknot.com/story20489888/considerations-to-know-about-bip39-seed-phrase-generator