C1111233133313231133133313331333133311221123121111113313231121211   >>    C111123313331323113313331333133313331122112312111111331323112121   <<    C1111233133313231133133313331333133311221123121111113313231121213   >>      C1111233133313231133133313331333133311221123121111113313231121212   >>