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: "constructing minimal phylogenetic networks from softwired clusters is fixed parameter tractable"
  Abstract: Here we show that, given a set of clusters C on a set of taxa X, where |X|=n, it is possible to determine in time f(k).poly(n) whether there exists a level-<= k network (i.e. a network where each biconnected component has reticulation number at most k) that represents all the clusters in C in the softwired sense, and if so to construct such a network. This extends a polynomial time result from "On the elusiveness of clusters" by Kelk, Scornavacca and Van Iersel(2011). By generalizing the concept of "level-k generator" to general networks, we then extend this fixed parameter tractability result to the problem where k refers not to the level but to the reticulation number of the whole network.

Connected through hyperedge HE-1 (induced by source paper "a tight kernel for computing the tree bisection and reconnection distance between two phylogenetic trees"):
  with members:
    - "on unrooted and root uncertain variants of several well known phylogenetic network problems"
    - "calculating the unrooted subtree prune and regraft distance"
    - "hybridization number on three rooted binary trees is ept"
    - "kernelizations for the hybridization number problem on multiple nonbinary trees"
    - "kernelization lower bounds by cross composition"

Connected through hyperedge HE-2 (induced by source paper "on unrooted and root uncertain variants of several well known phylogenetic network problems"):
  with members:
    - "kernelizations for the hybridization number problem on multiple nonbinary trees"

Connected through hyperedge HE-3 (induced by source paper "hybridization number on three trees"):
  with members:
    - "kernelizations for the hybridization number problem on multiple nonbinary trees"

Connected through hyperedge HE-4 (induced by source paper "kernelizations for the hybridization number problem on multiple nonbinary trees"):
  with members:
    - "hybridization number on three trees"

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.CC(Computational Complexity)