Hi,   
      
   What's a good admissible heuristic function for this number/slider   
   puzzle hybrid?   
      
   http://www.facebook.com/apps/application.php?id=20690165651   
      
   An obvious one would be equal to the absolute value of the lowest   
   negative number plus the largest positive number.   
      
   What's a better one?   
      
   Amir   
      
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