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What will be the output of the following program?

#include  
 enum xyz  
 {   
    a, b, c 
 }; 
 int main()
 {    
     int x = a, y = b, z = c;   
     int &p = x, &q = y, &r = z;    
     p = z;     
     p = ++q;     
     q = ++p;    
     z = ++q + p++;    
     cout" " " " return 0; 
 }