public class Test2
{   
   public static int x;   
   public static int foo(int y)   
   {         
      return y * 2;     
   }
    public static void main(String [] args)     
    {       
       int z = 5;      
       assert z > 0; /* Line 11 */     
       assert z > 2: foo(z); /* Line 12 */    
       if ( z 7 )         
            assert z > 4; /* Line 14 */       
     
    switch (z)         
    {           
       case 4: System.out.println("4 ");     
       case 5: System.out.println("5 ");        
       default: assert z 10;     
    }          
    if ( z 10 )          
        assert z > 4: z++; /* Line 22 */     
        System.out.println(z);    
  } 
} 

which line is an example of an inappropriate use of assertions?