C1111233131211111211113313331333133313231313331311331323123232321311   >>    C111123313121111121111331333133313331323131333131133132312323232131   <<    C1111233131211111211113313331333133313231313331311331323123232321313   >>      C1111233131211111211113313331333133313231313331311331323123232321312   >>