C1111233133313231133133313231333133313113313113313233313233212121   >>    C111123313331323113313331323133313331311331311331323331323321212   <<    C1111233133313231133133313231333133313113313113313233313233212123   >>      C1111233133313231133133313231333133313113313113313233313233212122   >>