C1111233133313231133133313331333133311221123121111113313113313121123311   >>    C111123313331323113313331333133313331122112312111111331311331312112331   <<    C1111233133313231133133313331333133311221123121111113313113313121123313   >>      C1111233133313231133133313331333133311221123121111113313113313121123312   >>