h object as 
  its result. This is a simplification. Actually, for the sake of genericity, 
  parsers are really not hard-coded to return a match object. More accurately, 
  a parser returns an object that adheres to a conceptual interface, of which 
  the match is an example. Nevertheless, we shall call the result type of a parser 
  a match object regardless if it is actually a match class, a derivative or a 
  totally unrelated type.</p>
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