C31232233133313221211113313331333133313113311331333133313113313232221311   >>    C3123223313331322121111331333133313331311331133133313331311331323222131   <<    C31232233133313221211113313331333133313113311331333133313113313232221313   >>      C31232233133313221211113313331333133313113311331333133313113313232221312   >>