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: "recognition of unipolar and generalised split graphs"
  Abstract: A graph is unipolar if it can be partitioned into a clique and a disjoint union of cliques, and a graph is a generalised split graph if it or its complement is unipolar. A unipolar partition of a graph can be used to find efficiently the clique number, the stability number, the chromatic number, and to solve other problems that are hard for general graphs. We present the first $O(n^2)$ time algorithm for recognition of $n$-vertex unipolar and generalised split graphs, improving on previous $O(n^3)$ time algorithms.

Connected through hyperedge HE-1 (induced by source paper "solving partition problems almost always requires pushing many vertices around"):
  with members:
    - "partitioning a graph into disjoint cliques and a triangle free graph"
    - "a polynomial kernel for proper interval vertex deletion"
    - "algorithms for unipolar and generalized split graphs"

Connected through hyperedge HE-2 (induced by source paper "recognizing graphs close to bipartite graphs with an application to colouring reconfiguration"):
  with members:
    - "independent feedback vertex sets for graphs of bounded diameter"
    - "independent feedback vertex set for p_5 free graphs"
    - "partitioning a triangle free planar graph into a forest and a forest of bounded degree"
    - "finding shortest paths between graph colourings"
    - "brooks vertex colouring theorem in linear time"

Connected through hyperedge HE-3 (induced by source paper "parameterized algorithms for recognizing monopolar and 2 subcolorable graphs"):
  with members:
    - "parameterized algorithms on perfect graphs for deletion to r ell graphs"
    - "algorithms for unipolar and generalized split graphs"

Connected through hyperedge HE-4 (induced by source paper "on chordal k generalized split graphs"):
  with members:
    - "on efficient domination for some classes of h free chordal graphs"

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.DS(Data Structures and Algorithms)