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: "model checking problems as a basis for parameterized intractability"
  Abstract: Most parameterized complexity classes are defined in terms of a parameterized#N#version of the Boolean satisfiability problem (the so-called weighted#N#satisfiability problem). For example, Downey and Fellow's W-hierarchy is of#N#this form. But there are also classes, for example, the A-hierarchy, that are#N#more naturally characterised in terms of model-checking problems for certain#N#fragments of first-order logic.#N#  Downey, Fellows, and Regan were the first to establish a connection between#N#the two formalisms by giving a characterisation of the W-hierarchy in terms of#N#first-order model-checking problems. We improve their result and then prove a#N#similar correspondence between weighted satisfiability and model-checking#N#problems for the A-hierarchy and the W^*-hierarchy. Thus we obtain very uniform#N#characterisations of many of the most important parameterized complexity#N#classes in both formalisms.#N#  Our results can be used to give new, simple proofs of some of the core#N#results of structural parameterized complexity theory.

Connected through hyperedge HE-1 (induced by source paper "obtaining a proportional allocation by deleting items"):
  with members:
    - "fair assignment of indivisible objects under ordinal preferences"

Connected through hyperedge HE-2 (induced by source paper "on space efficiency of algorithms working on structural decompositions of graphs"):
  with members:
    - "an o n epsilon space and polynomial time algorithm for reachability in directed layered planar graphs"
    - "space saving by dynamic algebraization"
    - "one hierarchy spawns another graph deconstructions and the complexity classification of conjunctive queries"
    - "space time tradeoffs for subset sum an improved worst case algorithm"
    - "where first order and monadic second order logic coincide"
    - "narrow sieves for parameterized paths and packings"

Connected through hyperedge HE-3 (induced by source paper "the computational landscape of permutation patterns"):
  with members:
    - "finding small patterns in permutations in linear time"
    - "a fast algorithm for permutation pattern matching based on alternating runs"

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)