ILookup.cs

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using System.Collections;
using System.Collections.Generic;
 
namespace System.Linq;
 
public interface ILookup<TKey, TElement> : IEnumerable<IGrouping<TKey, TElement>>, IEnumerable
{
    int Count { get; }
 
    IEnumerable<TElement> this[TKey key] { get; }
 
    bool Contains(TKey key);
}