Nico du Bois wrote:   
   > In short, the problem is that your sets are not well defined. There must be   
   > a symmetrical overlap at 50% membership for triangular sets. And that is   
      
   This is a very strong statement.   
   I beg to differ. There *has* to be some overlap, but it *doesn't have*   
   to be necessarily 50%.   
      
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