I took the index of the words, converted the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to convert it to binary, additional three zeros for the eight digits with the binary and got 00000010011 which interprets to 19 in decimal. https://peakbookmarks.com/story19685007/bip39-phrase-generator-can-be-fun-for-anyone