> 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?   
      
   Hi,   
      
   What about summing up squares of all the numbers?   
      
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