public static IEnumerable<string> 出現頻度の高い順に並べる(IEnumerable<string> texts)
		{
			var sortedList = new SortedList<string, int>();
			foreach (var text in texts)
			{
				if (sortedList.ContainsKey(text))
				{
					sortedList[text]++;
				}
				else
				{
					sortedList.Add(text, 1);
				}
			}
			return texts.OrderByDescending(x => sortedList[x]);
		}