C1111233133313231133133313331333131211111331121211113313233212312121   >>    C111123313331323113313331333133313121111133112121111331323321231212   <<    C1111233133313231133133313331333131211111331121211113313233212312123   >>      C1111233133313231133133313331333131211111331121211113313233212312122   >>