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#if NET20 || NET30 || NET35 || !NET_4_6
namespace System.Collections.Generic
{
public interface ISet<T> : ICollection<T>
{
new bool Add(T item);
void ExceptWith(IEnumerable<T> other);
void IntersectWith(IEnumerable<T> other);
bool IsProperSubsetOf(IEnumerable<T> other);
bool IsProperSupersetOf(IEnumerable<T> other);
bool IsSubsetOf(IEnumerable<T> other);
bool IsSupersetOf(IEnumerable<T> other);
bool Overlaps(IEnumerable<T> other);
bool SetEquals(IEnumerable<T> other);
void SymmetricExceptWith(IEnumerable<T> other);
void UnionWith(IEnumerable<T> other);
}
}
#endif