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  1. Notice that there are several static variables:  "nextFree",
  2. "cacheSize", "numUsed", and "pCache".  These static variables are
  3. used to manage the cache.  "nextFree" points to the first free
  4. "CachedNode" in the cache.  "cacheSize" is the maximum number of
  5. nodes that can be stored in the cache.  "numUsed" is the number of
  6. nodes in the cache.
  7.