C1111233131211111211113313331333133313232212111133131133133313231123321   >>    C111123313121111121111331333133313331323221211113313113313331323112332   <<    C1111233131211111211113313331333133313232212111133131133133313231123323   >>      C1111233131211111211113313331333133313232212111133131133133313231123322   >>