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: "parameterized algorithmics for computational social choice nine research challenges"
  Abstract: Computational Social Choice is an interdisciplinary research area involving Economics, Political Science, and Social Science on the one side, and Mathematics and Computer Science (including Artificial Intelligence and Multiagent Systems) on the other side. Typical computational problems studied in this field include the vulnerability of voting procedures against attacks, or preference aggregation in multi-agent systems. Parameterized Algorithmics is a subfield of Theoretical Computer Science seeking to exploit meaningful problem-specific parameters in order to identify tractable special cases of in general computationally hard problems. In this paper, we propose nine of our favorite research challenges concerning the parameterized complexity of problems appearing in this context.

Connected through hyperedge HE-1 (induced by source paper "stable marriage with multi modal preferences"):
  with members:
    - "stable roommates with narcissistic single peaked and single crossing preferences"
    - "a polynomial time randomized reduction from tournament isomorphism to tournament asymmetry"
    - "stable matching with uncertain linear preferences"
    - "assessing the computational complexity of multi layer subgraph detection"
    - "the one dimensional euclidean domain finitely many obstructions are not enough"
    - "are there any nicely structured preference profiles nearby"
    - "stable marriage with general preferences"
    - "clone structures in voters preferences"

Connected through hyperedge HE-2 (induced by source paper "mixed integer programming with convex concave constraints fixed parameter tractability and applications to multicovering and voting"):
  with members:
    - "a parameterized strongly polynomial algorithm for block structured integer programs"
    - "faster algorithms for integer programs with block structure"
    - "fair knapsack"
    - "scheduling meets n fold integer programming"
    - "evaluating and tuning n fold integer programming"
    - "combinatorial n fold integer programming and applications"
    - "integer programming in parameterized complexity three miniatures"
    - "solving integer linear programs with a small number of global variables and constraints"

Connected through hyperedge HE-3 (induced by source paper "combinatorial n fold integer programming and applications"):
  with members:
    - "a parameterized strongly polynomial algorithm for block structured integer programs"
    - "on integer programming and convolution"
    - "scheduling meets n fold integer programming"
    - "the complexity landscape of decompositional parameters for ilp"
    - "proximity results and faster algorithms for integer programming using the steinitz lemma"
    - "simplified algorithmic metatheorems beyond mso treewidth and neighborhood diversity"
    - "voting and bribing in single exponential time"
    - "about the structure of the integer cone and its application to bin packing"

Connected through hyperedge HE-4 (induced by source paper "balanced stable marriage how close is close enough"):
  with members:
    - "stable marriage with groups of similar agents"
    - "on treewidth and stable marriage"
    - "how hard is it to satisfy almost all roommates"
    - "on parameterized complexity of group activity selection problems on social networks"
    - "group activity selection on social networks"
    - "stable marriage with covering constraints a complete computational trichotomy"
    - "raising the bar for vertex cover fixed parameter tractability above a higher guarantee"
    - "faster parameterized algorithms using linear programming"

Connected through hyperedge HE-5 (induced by source paper "on the computational complexity of variants of combinatorial voter control in elections"):
  with members:
    - "elections with few voters candidate control can be easy"
    - "combinatorial voter control in elections"
    - "weighted electoral control"
    - "schulze and ranked pairs voting are fixed parameter tractable to bribe manipulate and control"
    - "multimode control attacks on elections"
    - "anyone but him the complexity of precluding an alternative"

Connected through hyperedge HE-6 (induced by source paper "parameterized algorithmics for graph modification problems on interactions with heuristics"):
  with members:
    - "win win kernelization for degree sequence completion problems"
    - "improved upper and lower bound heuristics for degree anonymization in social networks"
    - "faster parameterized algorithms using linear programming"
    - "approximation and tidying a problem kernel for s plex cluster vertex deletion"

Connected through hyperedge HE-7 (induced by source paper "approximation and parameterized complexity of minimax approval voting"):
  with members:
    - "slightly superexponential parameterized problems"
    - "finding a collective set of items from proportional multirepresentation to group recommendation"
    - "on the closest string and substring problems"

Connected through hyperedge HE-8 (induced by source paper "prices matter for the parameterized complexity of shift bribery"):
  with members:
    - "complexity of shift bribery in committee elections"
    - "parliamentary voting procedures agenda control manipulation and uncertainty"
    - "campaign management under approval driven voting rules"
    - "elections with few voters candidate control can be easy"
    - "combinatorial voter control in elections"
    - "determining possible and necessary winners under common voting rules given partial orders"
    - "taking the final step to a full dichotomy of the possible winner problem in pure scoring rules"
    - "multimode control attacks on elections"

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.MA(Multiagent Systems)