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using System;
using System.Collections;
using System.Collections.Generic;
public delegate int Int2Int (int i);
public class FunEnumerable
{
int size;
Int2Int f;
public FunEnumerable(int size, Int2Int f)
{
this.size = size; this.f = f;
}
public IEnumerator<int> GetEnumerator()
{
yield return f (size);
}
}
class X
{
public static void Main ()
{ }
}
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