ISet.cs

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namespace System.Collections.Generic;
 
public interface ISet<T> : ICollection<T>, IEnumerable<T>, IEnumerable
{
    new bool Add(T item);
 
    void UnionWith(IEnumerable<T> other);
 
    void IntersectWith(IEnumerable<T> other);
 
    void ExceptWith(IEnumerable<T> other);
 
    void SymmetricExceptWith(IEnumerable<T> other);
 
    bool IsSubsetOf(IEnumerable<T> other);
 
    bool IsSupersetOf(IEnumerable<T> other);
 
    bool IsProperSupersetOf(IEnumerable<T> other);
 
    bool IsProperSubsetOf(IEnumerable<T> other);
 
    bool Overlaps(IEnumerable<T> other);
 
    bool SetEquals(IEnumerable<T> other);
}