I took the index of the words, converted the range to binary, additional three zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to convert it to binary, additional 3 zeros to the eight digits on the binary and got 00000010011 which translates to 19 in decimal. https://maximusbookmarks.com/story18990665/a-secret-weapon-for-bip39-words-to-numbers