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: "beyond hypertree width decomposition methods without decompositions"
  Abstract: The general intractability of the constraint satisfaction problem has motivated the study of restrictions on this problem that permit polynomial-time solvability. One major line of work has focused on structural restrictions, which arise from restricting the interaction among constraint scopes. In this paper, we engage in a mathematical investigation of generalized hypertree width, a structural measure that has up to recently eluded study. We obtain a number of computational results, including a simple proof of the tractability of CSP instances having bounded generalized hypertree width.

Connected through hyperedge HE-1 (induced by source paper "complexity analysis of general and fractional hypertree decompositions"):
  with members:
    - "hyperbench a benchmark and tool for hypergraphs and empirical findings"
    - "tree projections and constraint optimization problems fixed parameter tractability and parallel algorithms"
    - "size bounds and query plans for relational joins"
    - "constraint solving via fractional edge covers"
    - "an analytical study of large sparql query logs"
    - "old techniques for new join algorithms a case study in rdf processing"
    - "general and fractional hypertree decompositions hard and easy cases"
    - "myhill nerode methods for hypergraphs"

Connected through hyperedge HE-2 (induced by source paper "a more general theory of static approximations for conjunctive queries"):
  with members:
    - "constraint solving via fractional edge covers"
    - "semantic acyclicity under constraints"
    - "general and fractional hypertree decompositions hard and easy cases"
    - "decidability results for the boundedness problem"
    - "querying the guarded fragment"
    - "hypertree decompositions and tractable queries"

Connected through hyperedge HE-3 (induced by source paper "tree projections and constraint optimization problems fixed parameter tractability and parallel algorithms"):
  with members:
    - "constraint solving via fractional edge covers"
    - "greedy strategies and larger islands of tractability for conjunctive queries and constraint satisfaction problems"
    - "general and fractional hypertree decompositions hard and easy cases"
    - "aggregations over generalized hypertree decompositions"
    - "faq questions asked frequently"
    - "structural tractability of enumerating csp solutions"
    - "a quasi polynomial time partition oracle for graphs with an excluded minor"
    - "possibilistic constraint satisfaction problems or how to handle soft constraints"

Connected through hyperedge HE-4 (induced by source paper "constraint solving via fractional edge covers"):
  with members:
    - "size bounds and query plans for relational joins"
    - "worst case optimal join algorithms"
    - "tractable hypergraph properties for constraint satisfaction and conjunctive queries"
    - "hypertree decompositions and tractable queries"

Connected through hyperedge HE-5 (induced by source paper "general and fractional hypertree decompositions hard and easy cases"):
  with members:
    - "size bounds and query plans for relational joins"
    - "constraint solving via fractional edge covers"
    - "an analytical study of large sparql query logs"
    - "old techniques for new join algorithms a case study in rdf processing"
    - "myhill nerode methods for hypergraphs"
    - "faq questions asked frequently"
    - "joins via geometric resolutions worst case and beyond"
    - "gym a multiround join algorithm in mapreduce"

Connected through hyperedge HE-6 (induced by source paper "semantic acyclicity under constraints"):
  with members:
    - "query rewriting and optimization for ontological databases"
    - "querying the guarded fragment"
    - "converging to the chase a tool for finite controllability"

Connected through hyperedge HE-7 (induced by source paper "structural tractability of enumerating csp solutions"):
  with members:
    - "size bounds and query plans for relational joins"
    - "constraint solving via fractional edge covers"
    - "tree projections and structural decomposition methods the power of local consistency and larger islands of tractability"
    - "first order query evaluation on structures of bounded degree"
    - "tractable hypergraph properties for constraint satisfaction and conjunctive queries"
    - "first order queries on structures of bounded degree are computable with constant delay"
    - "hypertree decompositions and tractable queries"

Connected through hyperedge HE-8 (induced by source paper "one hierarchy spawns another graph deconstructions and the complexity classification of conjunctive queries"):
  with members:
    - "the fine classification of conjunctive queries and parameterized logarithmic space complexity"
    - "arc consistency and friends"
    - "tractable hypergraph properties for constraint satisfaction and conjunctive queries"
    - "linear datalog and bounded path duality of relational structures"
    - "hypertree decompositions and tractable queries"
    - "fixed parameter tractability definability and model checking"

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)