namespace System.Collections.Generic
{
    public class PriorityQueue<TElement, TPriority>
    {
        public sealed class UnorderedItemsCollection : IEnumerable, IEnumerable<(TElement Element, TPriority Priority)>, IReadOnlyCollection<(TElement Element, TPriority Priority)>, ICollection
        {
            public struct Enumerator : IEnumerator, IEnumerator<(TElement Element, TPriority Priority)>, IDisposable
            {
                public bool MoveNext();
            }
        }
    }
}