I took the index of the words, transformed the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the first Component of the hexadecimal to transform it to binary, additional three zeros for the eight digits from the binary and obtained 00000010011 which interprets to 19 in decimal. https://bookmarkunit.com/story18854873/not-known-factual-statements-about-bip39-explained