"There are fifteen tyrants and fifteen helpless citizens on a ship, way too many for the size of the ship. So, it is decided that the tyrants must be thrown overboard to prevent the ship from sinking. A mythical beast, who cannot distinguish between tyrants and citizens, has been let loose on the ship to throw people overboard. The beast has been trained to throw over every ninth person seated in a circle. How can the people on board be arranged in a circle so that the beast can do the job it is expected to do?".
