C111123313331323113313331333133313121111133112121111331311221123232233133311   >>    C11112331333132311331333133313331312111113311212111133131122112323223313331   <<    C111123313331323113313331333133313121111133112121111331311221123232233133313   >>      C111123313331323113313331333133313121111133112121111331311221123232233133312   >>