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  57. <span id="Implementation-Details-1"></span><h2 class="chapter">11 Implementation Details</h2>
  58. <p>Here we document details of how the preprocessor&rsquo;s implementation
  59. affects its user-visible behavior. You should try to avoid undue
  60. reliance on behavior described here, as it is possible that it will
  61. change subtly in future implementations.
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  63. <p>Also documented here are obsolete features still supported by CPP.
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