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: "dichotomies properties on computational complexity of s packing coloring problems"
  Abstract: This work establishes the complexity class of several instances of the S-packing coloring problem: for a graph G, a positive integer k and a non decreasing list of integers S = (s\_1 , ..., s\_k ), G is S-colorable, if its vertices can be partitioned into sets S\_i , i = 1,... , k, where each S\_i being a s\_i -packing (a set of vertices at pairwise distance greater than s\_i). For a list of three integers, a dichotomy between NP-complete problems and polynomial time solvable problems is determined for subcubic graphs. Moreover, for an unfixed size of list, the complexity of the S-packing coloring problem is determined for several instances of the problem. These properties are used in order to prove a dichotomy between NP-complete problems and polynomial time solvable problems for lists of at most four integers.

Connected through hyperedge HE-1 (induced by source paper "spectrum graph coloring to improve wi fi channel assignment in a real world scenario via edge contraction"):
  with members:
    - "spectrum graph coloring and applications to wi fi channel assignment"

Connected through hyperedge HE-2 (induced by source paper "spectrum graph coloring and applications to wi fi channel assignment"):
  with members:
    - "a dsatur based algorithm for the equitable coloring problem"

Connected through hyperedge HE-3 (induced by source paper "packing coloring of undirected and oriented generalized theta graphs"):
  with members:
    - "on packing colorings of distance graphs"
    - "packing chromatic number of distance graphs"
    - "the packing chromatic number of the square lattice is at least 12"

Connected through hyperedge HE-4 (induced by source paper "subdivision into i packings and s packing chromatic number of some lattices"):
  with members:
    - "on packing colorings of distance graphs"
    - "the packing chromatic number of the square lattice is at least 12"

Connected through hyperedge HE-5 (induced by source paper "s packing colorings of cubic graphs"):
  with members:
    - "subdivision into i packings and s packing chromatic number of some lattices"
    - "the packing chromatic number of the square lattice is at least 12"

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)