In every case of political unrest in a certain country, the police have discovered that some unknown person or persons organized and fomented that unrest
Clearly, ttherefore, behind all the cases of political unrest in that country there has been a single mastermind who organized and fomented them all
Every Chicago driver has a number on his or her license, so the number on some Chicago driver's license is the exact average of the numbers on all Chicago drivers' licenses.