Unique pairs
              
                
                  
                
              
            
            Define a procedure 
unique-pairs
 that, given an integer 
n
, generates the sequence of pairs 
(i,j)
 with 
1 ≤ j < i ≤ n
. Use 
unique-pairs
 to simplify the definition of 
prime-sum-pairs
 given above.
            
            
                          
           
          
            
      
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