IEnumerable and order

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IEnumerable/IEnumerable<T> makes no guarantees about ordering, but the implementations that use IEnumerable/IEnumerable<T>may or may not guarantee ordering.

For instance, if you enumerate List<T>, order is guaranteed, but if you enumerate HashSet<T> no such guarantee is provided, yet both will be enumerated using the IEnumerable<T> interface.

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