C11111211113313112113313331333133313231311331333133311221123232321233121   >>    C1111121111331311211331333133313331323131133133313331122112323232123312   <<    C11111211113313112113313331333133313231311331333133311221123232321233123   >>      C11111211113313112113313331333133313231311331333133311221123232321233122   >>