I took the index of the words, converted the selection to binary, extra three zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to convert it to binary, added three zeros into the 8 digits on the binary and obtained 00000010011 which translates to 19 in decimal. https://bookmark-media.com/story18901657/5-essential-elements-for-bip39-explained