I took the index in the words, converted the range to binary, additional 3 zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to transform it to binary, extra three zeros to the 8 digits of your binary and received 00000010011 which translates to 19 in decimal. https://expressbookmark.com/story18804579/bip39-phrase-generator-can-be-fun-for-anyone