From: questsin@rogers.com   
      
   Thanks Ted,   
      
   I implemented as much as the changes I understood.   
      
   How would you suggest I describe how the add and subtract operators   
   work. The only way I can think of, If a word has multiple meanings, by   
   subtracting a word similarly related to the alternate meanning you can   
   "lock in" to the original one.   
      
   for example   
   dog, cat, mouse - are all commonly known animals.   
      
   however cat is also a unix command and made common because computer   
   science is so wildy discussed on the internet.   
   ls, cat, man, are all commands   
      
   by subtracting "ls" and not "cat" we can create a set of common animals   
   excluding unix commands but including cat.   
      
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