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: "smodels a system for answer set programming"
  Abstract: The Smodels system implements the stable model semantics for normal logic programs. It handles a subclass of programs which contain no function symbols and are domain-restricted but supports extensions including built-in functions as well as cardinality and weight constraints. On top of this core engine more involved systems can be built. As an example, we have implemented total and partial stable model computation for disjunctive logic programs. An interesting application method is based on answer set programming, i.e., encoding an application problem as a set of rules so that its solutions are captured by the stable models of the rules. Smodels has been applied to a number of areas including planning, model checking, reachability analysis, product configuration, dynamic constraint satisfaction, and feature interaction.

Connected through hyperedge HE-1 (induced by source paper "justifying answer sets using argumentation"):
  with members:
    - "generating explanations for biomedical queries"
    - "automatic music composition using answer set programming"
    - "justifications for logic programs under answer set semantics"
    - "defeasible logic programming an argumentative approach"

Connected through hyperedge HE-2 (induced by source paper "improving the deductive system des with persistence by using sql dbms s"):
  with members:
    - "xsb extending prolog with tabled logic programming"
    - "experimenting with recursive queries in database and logic programming systems"
    - "the dlv system for knowledge representation and reasoning"
    - "the deductive database system ldl"

Connected through hyperedge HE-3 (induced by source paper "constraint propagation for first order logic and inductive definitions"):
  with members:
    - "lifted unit propagation for effective grounding"
    - "grounding fo and fo id with bounds"
    - "fo fd extending classical logic with rule based fixpoint definitions"
    - "design and implementation of aggregate functions in the dlv system"
    - "the dlv system for knowledge representation and reasoning"
    - "well founded and stable semantics of logic programs with aggregates"
    - "propositional satisfiability in answer set programming"
    - "extending classical logic with inductive definitions"

Connected through hyperedge HE-4 (induced by source paper "discovering classes of strongly equivalent logic programs"):
  with members:
    - "the dlv system for knowledge representation and reasoning"
    - "strong equivalence made easy nested expressions and weight constraints"
    - "comparisons and computation of well founded semantics for disjunctive logic programs"

Connected through hyperedge HE-5 (induced by source paper "experimenting with recursive queries in database and logic programming systems"):
  with members:
    - "the dlv system for knowledge representation and reasoning"
    - "the deductive database system ldl"

Connected through hyperedge HE-6 (induced by source paper "the dlv system for knowledge representation and reasoning"):
  with members:
    - "unfolding partiality and disjunctions in stable model semantics"
    - "answer set planning under action costs"
    - "a logic programming approach to knowledge state planning ii the dlv k system"
    - "computing preferred answer sets by meta interpretation in answer set programming"
    - "a polynomial translation of logic programs with nested expressions into disjunctive logic programs preliminary report"
    - "disjunctive logic programs with inheritance"
    - "on properties of update sequences based on causal rejection"
    - "propositional satisfiability in answer set programming"

Connected through hyperedge HE-7 (induced by source paper "computing preferred answer sets by meta interpretation in answer set programming"):
  with members:
    - "on the expressibility of stable logic programming"
    - "answer set planning under action costs"
    - "logic programs with compiled preferences"
    - "well founded semantics for extended logic programs with dynamic preferences"

Connected through hyperedge HE-8 (induced by source paper "answer set planning under action costs"):
  with members:
    - "a logic programming approach to knowledge state planning ii the dlv k system"
    - "conformant planning via symbolic model checking"
    - "dlv a system for declarative problem solving"

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.AI(Artificial Intelligence)