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: "optimal reallocation under additive and ordinal preferences"
  Abstract: Reallocating resources to get mutually beneficial outcomes is a fundamental problem in various multi-agent settings. In the first part of the paper we focus on the setting in which agents express additive cardinal utilities over objects. We present computational hardness results as well as polynomial-time algorithms for testing Pareto optimality under different restrictions such as two utility values or lexicographic utilities. In the second part of the paper we assume that agents express only their (ordinal) preferences over single objects, and that their preferences are additively separable. In this setting, we present characterizations and polynomial-time algorithms for possible and necessary Pareto optimality.

Connected through hyperedge HE-1 (induced by source paper "swap dynamics in single peaked house markets"):
  with members:
    - "minimal envy and popular matchings"
    - "fair assignment of indivisible objects under ordinal preferences"
    - "eliciting single peaked preferences using comparison queries"
    - "extremal behaviour in multiagent contract negotiation"

Connected through hyperedge HE-2 (induced by source paper "fair allocation of combinations of indivisible goods and chores"):
  with members:
    - "almost envy free allocations with connected bundles"
    - "competitive division of a mixed manna"
    - "approximation algorithms for computing maximin share allocations"
    - "fair division of a graph"
    - "dividing goods or bads under additive utilities"
    - "fair assignment of indivisible objects under ordinal preferences"

Connected through hyperedge HE-3 (induced by source paper "pareto optimal allocation of indivisible goods with connectivity constraints"):
  with members:
    - "fairly allocating contiguous blocks of indivisible items"
    - "fairly allocating many goods with few queries"
    - "almost envy free allocations with connected bundles"
    - "fair division via social comparison"

Connected through hyperedge HE-4 (induced by source paper "efficiency sequenceability and deal optimality in fair division of indivisible goods"):
  with members:
    - "efficiency and sequenceability in fair division of indivisible goods with additive preferences"
    - "possible and necessary allocations via sequential mechanisms"
    - "fair assignment of indivisible objects under ordinal preferences"
    - "a social welfare optimal sequential allocation procedure"

Connected through hyperedge HE-5 (induced by source paper "fair allocation based on diminishing differences"):
  with members:
    - "flexible level 1 consensus ensuring stable social choice analysis and algorithms"
    - "competitive equilibrium for almost all incomes"
    - "fair assignment of indivisible objects under ordinal preferences"
    - "a social welfare optimal sequential allocation procedure"
    - "a note on the undercut procedure"

Connected through hyperedge HE-6 (induced by source paper "pareto optimal allocation under uncertain preferences"):
  with members:
    - "size versus truthfulness in the house allocation problem"
    - "stable matching with uncertain linear preferences"

Connected through hyperedge HE-7 (induced by source paper "efficient reallocation under additive and responsive preferences"):
  with members:
    - "pareto optimal allocation under uncertain preferences"

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.GT(Computer Science and Game Theory)