I took the index of your words, converted the range to binary, additional three zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to convert it to binary, added 3 zeros to the eight digits from the binary and obtained 00000010011 which interprets to 19 in decimal. https://isocialfans.com/story4632081/new-step-by-step-map-for-bip39-english-words