human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "a generalization of lee codes"
  Abstract: Motivated by a problem in computer architecture we introduce a notion of the perfect distance-dominating set, PDDS, in a graph. PDDSs constitute a generalization of perfect Lee codes, diameter perfect codes, as well as other codes and dominating sets. In this paper we initiate a systematic study of PDDSs. PDDSs related to the application will be constructed and the non-existence of some PDDSs will be shown. In addition, an extension of the long-standing Golomb-Welch conjecture, in terms of PDDS, will be stated. We note that all constructed PDDSs are lattice-like which is a very important feature from the practical point of view as in this case decoding algorithms tend to be much simpler.

Connected through hyperedge HE-1 (induced by source paper "50 years of the golomb welch conjecture"):
  with members:
    - "quasi perfect lee codes of radius 2 and arbitrarily large dimension"
    - "an algebraic geometric approach to nivat s conjecture"
    - "a new approach towards the golomb welch conjecture"
    - "diameter perfect lee codes"
    - "quasi cross lattice tilings with applications to flash memory"
    - "product constructions for perfect lee codes"
    - "error correction of multidimensional bursts"

Connected through hyperedge HE-2 (induced by source paper "quasi perfect lee codes of radius 2 and arbitrarily large dimension"):
  with members:
    - "a new approach towards the golomb welch conjecture"
    - "coding for the lee and manhattan metrics with weighing matrices"
    - "diameter perfect lee codes"
    - "product constructions for perfect lee codes"

Connected through hyperedge HE-3 (induced by source paper "a new approach towards the golomb welch conjecture"):
  with members:
    - "diameter perfect lee codes"
    - "product constructions for perfect lee codes"

Connected through hyperedge HE-4 (induced by source paper "on the linear programming bound for lee codes"):
  with members:
    - "product constructions for perfect lee codes"
    - "dense error correcting codes in the lee metric"

Connected through hyperedge HE-5 (induced by source paper "diameter perfect lee codes"):
  with members:
    - "quasi cross lattice tilings with applications to flash memory"
    - "product constructions for perfect lee codes"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.DM(Discrete Mathematics)