C1111233131211111211113313331333133313232212111133133311233112121   >>    C111123313121111121111331333133313331323221211113313331123311212   <<    C1111233131211111211113313331333133313232212111133133311233112123   >>      C1111233131211111211113313331333133313232212111133133311233112122   >>