I took the index from the words, converted the variety to binary, added 3 zeros, calculated the sha256 digest, took the main Section of the hexadecimal to transform it to binary, additional 3 zeros to your eight digits of the binary and acquired 00000010011 which translates to 19 in decimal. https://socialinplace.com/story4447618/little-known-facts-about-bip39-words