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: "generic and efficient program monitoring by trace analysis"
  Abstract: Program execution monitoring consists of checking whole executions for given properties in order to collect global run-time information. #R##N#Monitoring is very useful to maintain programs. However, application developers face the following dilemma: either they use existing tools which never exactly fit their needs, or they invest a lot of effort to implement monitoring code. #R##N#In this article we argue that, when an event-oriented tracer exists, the compiler developers can enable the application developers to easily code their own, relevant, monitors which will run efficiently. #R##N#We propose a high-level operator, called foldt, which operates on execution traces. One of the key advantages of our approach is that it allows a clean separation of concerns; the definition of monitors is neither intertwined in the user source code nor in the language compiler. #R##N#We give a number of applications of the foldt operator to compute monitors for Mercury program executions: execution profiles, graphical abstract views, and two test coverage measurements. Each example is implemented by a few simple lines of Mercury. #R##N#Detailed measurements show acceptable performance of the basic mechanism of foldt for executions of several millions of execution events.

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.PL(Programming Languages)