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What will be the output of the program?

 #include
 void fun(int); 
 typedef int (*pf) (int, int);
 int proc(pf, int, int);  

  int main() 
  {   
     int a=3;   
     fun(a);     
     return 0; 
 } 
 void fun(int n) 
 {     
     if(n > 0)    
     {       
        fun(--n);       
        printf("%d,", n);       
        fun(--n);    
   }
 }