I took the index on the words, transformed the amount to binary, extra three zeros, calculated the sha256 digest, took the primary Section of the hexadecimal to transform it to binary, included three zeros into the eight digits from the binary and received 00000010011 which translates to 19 in decimal. https://cyberbookmarking.com/story19536354/bip39-phrase-generator-can-be-fun-for-anyone