C111123313331323113313331333133313231323133313231311132313233313231211   >>    C11112331333132311331333133313331323132313331323131113231323331323121   <<    C111123313331323113313331333133313231323133313231311132313233313231213   >>      C111123313331323113313331333133313231323133313231311132313233313231212   >>