I took the index on the words, converted the amount to binary, included three zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, additional 3 zeros towards the eight digits on the binary and obtained 00000010011 which interprets to 19 in decimal. https://apollobookmarks.com/story18792189/fascination-about-bip39-english-words