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public class Sum : Expr { private readonly Expr _l, _r; public Sum(Expr...

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public class Sum : Expr

{

private readonly Expr _l, _r;

public Sum(Expr l, Expr r)=>(_l,_r)=(l,r);

public override int Eval(Context c) => _l.Eval(c) + _r.Eval(c);

}

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