C1111233133313231133133313331333133311221123121111121111123232212121   >>    C111123313331323113313331333133313331122112312111112111112323221212   <<    C1111233133313231133133313331333133311221123121111121111123232212123   >>      C1111233133313231133133313331333133311221123121111121111123232212122   >>