I took the index of your words, converted the variety to binary, included three zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to convert it to binary, extra 3 zeros into the 8 digits on the binary and bought 00000010011 which interprets to 19 in decimal. https://wiishlist.com/story19438997/new-step-by-step-map-for-bip39-english-words