C11112331333132311331333133313331333112211231211111211111211111333133322123211   >>    C1111233133313231133133313331333133311221123121111121111121111133313332212321   <<    C11112331333132311331333133313331333112211231211111211111211111333133322123213   >>      C11112331333132311331333133313331333112211231211111211111211111333133322123212   >>