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using System;
using System.Collections.Generic;
internal class RedBlackTree<S>
{
public delegate int RangeTester (S item);
public IEnumerable<S> EnumerateRange (RangeTester rangeTester)
{
yield break;
}
}
public class OrderedMultiDictionary<T,U>
{
private RedBlackTree<KeyValuePair<T,U>> tree;
private IEnumerator<T> EnumerateKeys (RedBlackTree<KeyValuePair<T,U>>.RangeTester rangeTester)
{
tree.EnumerateRange (rangeTester);
yield break;
}
}
class X
{
static void Main ()
{ }
}
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