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: "binary voting with delegable proxy an analysis of liquid democracy"
  Abstract: The paper provides an analysis of the voting method known as delegable proxy voting, or liquid democracy. The analysis first positions liquid democracy within the theory of binary aggregation. It then focuses on two issues of the system: the occurrence of delegation cycles; and the effect of delegations on individual rationality when voting on logically interdependent propositions. It finally points to proposals on how the system may be modified in order to address the above issues.

Connected through hyperedge HE-1 (induced by source paper "popular branchings and their dual certificates"):
  with members:
    - "the convergence of iterative delegations in liquid democracy in a social network"
    - "popular matching in roommates setting is np hard"
    - "popular matchings and limits to tractability"
    - "the fluid mechanics of liquid democracy"
    - "popular matchings with two sided preferences and one sided ties"
    - "popular edges and dominant matchings"

Connected through hyperedge HE-2 (induced by source paper "the convergence of iterative delegations in liquid democracy in a social network"):
  with members:
    - "on rational delegations in liquid democracy"
    - "flexible representative democracy an introduction with binary issues"
    - "the fluid mechanics of liquid democracy"

Connected through hyperedge HE-3 (induced by source paper "flexible representative democracy an introduction with binary issues"):
  with members:
    - "on rational delegations in liquid democracy"
    - "a mathematical model for optimal decisions in a representative democracy"
    - "the conference paper assignment problem using order weighted averages to assign indivisible goods"
    - "proxy voting for better outcomes"
    - "what do we elect committees for a voting committee model for multi winner rules"
    - "finding a collective set of items from proportional multirepresentation to group recommendation"
    - "justified representation in approval based committee voting"

Connected through hyperedge HE-4 (induced by source paper "the convergence of iterative delegations in liquid democracy"):
  with members:
    - "on rational delegations in liquid democracy"
    - "proxy voting for better outcomes"
    - "plurality voting under uncertainty"
    - "new results on equilibria in strategic candidacy"
    - "on the computation of fully proportional representation"

Connected through hyperedge HE-5 (induced by source paper "on rational delegations in liquid democracy"):
  with members:
    - "the fluid mechanics of liquid democracy"
    - "proxy voting for better outcomes"
    - "voting behaviour and power in online democracy a study of liquidfeedback in germany s pirate party"

Connected through hyperedge HE-6 (induced by source paper "iterative delegations in liquid democracy with restricted preferences"):
  with members:
    - "the convergence of iterative delegations in liquid democracy in a social network"
    - "the fluid mechanics of liquid democracy"
    - "on the computation of fully proportional representation"

Connected through hyperedge HE-7 (induced by source paper "the fluid mechanics of liquid democracy"):
  with members:
    - "voting behaviour and power in online democracy a study of liquidfeedback in germany s pirate party"

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)