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using System;
using System.Collections.Generic;
using GeoJSON.Net.Geometry;
namespace GeoJSON.Net
    internal static class PositionExtensions
        internal static Position ToPosition(this IEnumerable<double> coordinates)
            using (var enumerator = coordinates.GetEnumerator())
                double lat, lng, alt;
                if (!enumerator.MoveNext())
                    throw new ArgumentException("Expected 2 or 3 coordinates but got 0");
                lng = enumerator.Current;
                if (!enumerator.MoveNext())
                    throw new ArgumentException("Expected 2 or 3 coordinates but got 1");
                lat = enumerator.Current;
                if (!enumerator.MoveNext())
                    return new Position(lat, lng);
                alt = enumerator.Current;
                if (enumerator.MoveNext())
                    throw new ArgumentException("Expected 2 or 3 coordinates but got >= 4");
                return new Position(lat, lng, alt);

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