I took the index from the words, transformed the range to binary, extra 3 zeros, calculated the sha256 digest, took the first Element of the hexadecimal to transform it to binary, added three zeros into the 8 digits from the binary and bought 00000010011 which translates to 19 in decimal. https://bookmarkpressure.com/story19075374/5-essential-elements-for-bip39-explained