C111123313331323113313331333133313331323131211113313121111331333133313231231211   >>    C11112331333132311331333133313331333132313121111331312111133133313331323123121   <<    C111123313331323113313331333133313331323131211113313121111331333133313231231213   >>      C111123313331323113313331333133313331323131211113313121111331333133313231231212   >>