I took the index in the words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to convert it to binary, included 3 zeros towards the eight digits on the binary and acquired 00000010011 which translates to 19 in decimal. https://bookmarkpressure.com/story19075374/5-essential-elements-for-bip39-explained