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Assume the existence of a Window class with integer data members width and height. Overload the << operator for the Window class -- i.e., write a nonmember ostream-returning function that accepts a reference to an ostream object and a constant reference to a Window object and sends the following to the ostream: 'a (width x height) window' (without the quotes and with width and height replaced by the actual width and height of the window. Thus for example, if the window had width=80 and height=20, << would send 'a (80 x 20) window' to the ostream.) Don't forget to have the function return the proper value as well. Assume the operator has been declared a friend in the Window class .