C111123313331323113313331333133313231323133312111113231313232311   >>    C11112331333132311331333133313331323132313331211111323131323231   <<    C111123313331323113313331333133313231323133312111113231313232313   >>      C111123313331323113313331333133313231323133312111113231313232312   >>