$14\mathrm{.}6\mathrm{.}2$: Implement a class that simulates a traffic light.

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Implement a class that simulates a traffic light. The next method advances the color in the usual way, from green to yellow to red, then again to green. Provide two constructors, as described in the documentation of the public interface. Also supply a method that yields the number of times that this traffic light has been red.