tart's tail). </p>
<p>Spirit is greedy --using straight forward, naive RD. It is certainly possible 
  to implement the fully backtracking scheme presented above, but there will be 
  also certainly be a performance hit. The scheme will always try to match all 
  possible parser paths (full parser hierarchy traversal) until it reaches a point 
  of certainty, that the whole thing matches or fails to match. </p>
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