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The following content is about C++ countdown, which should be of great benefit to you.

# include

Using namespace std

Class Var

Class Base {

Public:

Virtual ~ Base () {}

Virtual ostream & print (ostream & o) const = 0

}

Ostream & operatorclone ();}

{return Expr (new Times (e1.e-> clone (), e2.e-> clone ());}

Ostream & operator

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