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If x is an object of class A, and y is an object of a class B that is a subclass of A, after the

If x is an object of class A, and y is an object of a class B that is a subclass of A, after the assignment x = y, why is x.m() illegal when m is a method of B but not A?

Some have claimed that deep inheritance hierarchies make system maintenance more difficult, not easier. Explain how that could be true.

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