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An object reference of type Letter can only refer to objects of Ex: Letter letter; Ps. this may seem like a trick question. Look at

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An object reference of type Letter can only refer to objects of Ex: Letter letter; Ps. this may seem like a trick question. Look at the PPTs. Can Letter look at its child's, child class? Letter and its children Letter and its parents Letter and objects that implement the same interface any compatible type

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