I took the index in the words, converted the selection to binary, extra 3 zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to transform it to binary, extra 3 zeros towards the eight digits on the binary and bought 00000010011 which translates to 19 in decimal. https://icelisting.com/story19847670/little-known-facts-about-bip39-words