C1111233131211111211113313331333133313232212111133131133133313233322321   >>    C111123313121111121111331333133313331323221211113313113313331323332232   <<    C1111233131211111211113313331333133313232212111133131133133313233322323   >>      C1111233131211111211113313331333133313232212111133131133133313233322322   >>