C1111233131211111211113313331333133313331333133313331333133313223313123123311   >>    C111123313121111121111331333133313331333133313331333133313331322331312312331   <<    C1111233131211111211113313331333133313331333133313331333133313223313123123313   >>      C1111233131211111211113313331333133313331333133313331333133313223313123123312   >>