private static void AssertNotEqual <T>(Indexed <T> first, Indexed <T> second)
{
Assert.IsFalse(first == second);
Assert.IsFalse(second == first);
Assert.IsTrue(first != second);
Assert.IsTrue(second != first);
Assert.IsFalse(first.Equals(second));
Assert.IsFalse(second.Equals(first));
Assert.IsFalse(object.Equals(first, second));
Assert.IsFalse(object.Equals(second, first));
Assert.AreNotEqual(first.GetHashCode(), second.GetHashCode());
}