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#if FAT
using System.Collections.Generic;
namespace LinqInternal.Collections
{
internal interface IReadOnlySet<T> : IReadOnlyCollection<T>
{
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);
}
}
#endif