C31231211113313121211113313331333133313331213331333133311211233133313231322121   >>    C3123121111331312121111331333133313331333121333133313331121123313331323132212   <<    C31231211113313121211113313331333133313331213331333133311211233133313231322123   >>      C31231211113313121211113313331333133313331213331333133311211233133313231322122   >>