C3123121111113313121111331333133313223313331333133313223313231312121   >>    C312312111111331312111133133313331322331333133313331322331323131212   <<    C3123121111113313121111331333133313223313331333133313223313231312123   >>      C3123121111113313121111331333133313223313331333133313223313231312122   >>