I took the index from the words, transformed the amount to binary, extra 3 zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to convert it to binary, additional three zeros on the 8 digits in the binary and received 00000010011 which translates to 19 in decimal. https://iwanttobookmark.com/story18913368/little-known-facts-about-bip39-words