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public class FixedEnumerable<T> : IEnumerable<T>
{
    private IList<T> _materialized;
    private readonly IEnumerable<T> _enumerable;

    public FixedEnumerable(IEnumerable<T> enumerable)
    {
        _enumerable = enumerable;
    }
    public FixedEnumerable(IList<T> list)
    {
        _materialized = list;
    }

    public IEnumerator<T> GetEnumerator()
    {
        if (_materialized == null)
            _materialized = _enumerable.ToList();

        return _materialized.GetEnumerator();
    }

    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }

    public static implicit operator FixedEnumerable<T>(List<T> list)
    {
        return new FixedEnumerable<T>(list);
    }
}

namespace System.Linq
{
    public static class FixedEnumerableExtentions
    {
        public static FixedEnumerable<T> ToFixed<T>(this IEnumerable<T> enumerable)
        {
            return new FixedEnumerable<T>(enumerable);
        }
    }

}

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