Write an abstract superclass encapsulating a vehicle: A vehicle
has two attributes: its owner's name and its number of wheels. This
class has two non-abstract subclasses: one encapsulating a bicycle,
ant the other encapsulating a motorized vehicle. A motorized
vehicle has the following additional attributes: its engine volume
displacement, in liters; and a method computing and returning a
measure of horsepower which is the number of liters times the
number of wheels. You also need to include a client class to test
these two classes.
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