class X2 {      

  public X2 x;

class X2 {      
   public X2 x;      
   public static void main(String [] args) {          
     X2 x2 = new X2();  /* Line 6 */          
     X2 x3 = new X2();  /* Line 7 */         
     x2.x = x3;          
     x3.x = x2;          
     x2 = new X2();          
     x3 = x2; /* Line 11 */          
     doComplexStuff();      
   }  
 }  

after line 11 runs, how many objects are eligible for garbage collection?

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