human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "as time goes by constraint handling rules a survey of chr research from 1998 to 2007"):
  Abstract: Constraint Handling Rules (CHR) is a high-level programming language based on multi-headed multiset rewrite rules. Originally designed for writing user-defined constraint solvers, it is now recognized as an elegant general purpose language. CHR-related research has surged during the decade following the previous survey by Fruehwirth. Covering more than 180 publications, this new survey provides an overview of recent results in a wide range of research areas, from semantics and analysis to systems, extensions and applications.

Includes members:
  Member "linear logic based analysis of constraint handling rules with disjunction":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "constraint handling rules what else")
  Member "a compositional semantics for chr":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "co inductive semantics for constraint handling rules")
  Member "acd term rewriting":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "rewriting constraint models with metamodels")
  Member "automatic generation of chr constraint solvers":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "constraint handling rules what else")
  Member "optimizing compilation of constraint handling rules in hal":
    also connected through other hyperedges:
      (none)
  Member "a chr based implementation of known arc consistency":
    also connected through other hyperedges:
      (none)
  Member "intelligent search strategies based on adaptive constraint handling rules":
    also connected through other hyperedges:
      (none)
  Member "flux a logic programming method for reasoning agents":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "abstract solvers for computing cautious consequences of asp programs")

Question: Please tell me which class the source paper 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.PL(Programming Languages)