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: "staging mixed initiative dialogs by program generation and transformation"
  Abstract: Specifying and implementing flexible human-computer dialogs, such as those used in ATMs, airport and train kiosks, and apps for smart phones and similar devices, is challenging because of the numerous and varied directions in which each user might steer a dialog, all of which must be captured in a specification and implementation of it. The purpose of this research is to improve dialog specification and implementation. To do so we enriched a notation based on concepts from programming languages, including currying and partial evaluation, for specifying a variety of unsolicited reporting, mixed-initiative dialogs in a concise representation which serves as a plan for implementing the dialog. We also built a dialog mining system which extracts specifications in this notation from dialog requirements. To demonstrate that the structure of a dialog specification in this notation provides a design for its implementation, we built a system which automatically generates an implementation (called a stager) for it given its representation in this notation. This resulted in a dialog modeling toolkit which automates the process of specifying and implementing dialogs. These results provide a proof of concept and demonstrate the promise of studying dialog specification and implementation from a programming languages perspective. The ubiquity of dialogs in domains such as banking and travel, education, and health care, combined with the increased use of smart phones as personal computing devices and the proliferation of apps for them, provide a fertile landscape for the application of these results.

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)