I took the index of your words, converted the selection to binary, extra three zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to convert it to binary, extra three zeros for the 8 digits of the binary and received 00000010011 which translates to 19 in decimal. https://get-social-now.com/story4214161/5-essential-elements-for-bip39-explained