I took the index on the words, transformed the amount to binary, extra 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to convert it to binary, included three zeros into the 8 digits on the binary and got 00000010011 which interprets to 19 in decimal. https://apollobookmarks.com/story18930151/fascination-about-bip39-english-words