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Consider the unary negation operator (-)used in the example above. What would be an alternative to defining Unary as a subclass of Expression, as is

Consider the unary negation operator (-)used in the example above. What would be an alternative to defining Unary as a subclass of Expression, as is now implemented in the Clite interpreter? For example, what implementation changes would be needed if we just added unary negation as another operator for the Binary class?

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