- using System; 
-   
- public class Test 
- { 
-   
-     static void Swap(ref string a, ref string b) { 
-         string c = b; 
-         b = a; 
-         a = c; 
-     } 
-   
- 	public static void Main() 
- 	{ 
- 	    string a = "a"; 
- 	    string b = "b"; 
- 	    Swap(ref a, ref b); 
- 	    Console.WriteLine(a); 
- 	    Console.WriteLine(b); 
- 	} 
- } 
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