C1111233131211111211113313331333133313232321333133313232233121113233311   >>    C111123313121111121111331333133313331323232133313331323223312111323331   <<    C1111233131211111211113313331333133313232321333133313232233121113233313   >>      C1111233131211111211113313331333133313232321333133313232233121113233312   >>