From: yuehai.wang@gmail.com   
      
   Hi, everyone,   
       I am seeking a suitable rule-based shell for the demo in   
   undergraduate class. I have read many news about some very good tools,   
   such as Leonardo shell, but it's turn to be very hard to find and to   
   use. Some tools are very complex and not suitable for class demo. it   
   can not be explained clearly within 1 hours to students.   
      So anyone can give me some advice which would be a suitable shell   
   to build a simple rule-based system and be simple enough to be   
   explained in one class time.   
      Thank you.   
      
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