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The Berkeley parser analyzes the grammatical structure of natural language using probabilistic context-free grammars (PCFGs).

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package edu.berkeley.nlp.util;

import java.util.*;

public class IdentityHashSet extends AbstractSet {
  private final Map map = new IdentityHashMap();
  public IdentityHashSet() { }
  public IdentityHashSet(Collection c) { for(E o : c) add(o); }
  public int size() { return map.size(); }
  public boolean contains(Object o) { return map.containsKey(o); }
  public Iterator iterator() { return map.keySet().iterator(); }
  public boolean add(E o) { return map.put(o, o) == null; }
  public boolean remove(Object o) { return map.remove(o) != null; }
  public void clear() { map.clear(); }
}