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: "petri nets and machines of things that flow"
  Abstract: Petri nets are an established graphical formalism for modeling and analyzing the behavior of systems. An important consideration of the value of Petri nets is their use in describing both the syntax and semantics of modeling formalisms. Describing a modeling notation in terms of a formal technique such as Petri nets provides a way to minimize ambiguity. Accordingly, it is imperative to develop a deep and diverse understanding of Petri nets. This paper is directed toward a new, but preliminary, exploration of the semantics of such an important tool. Specifically, the concern in this paper is with the semantics of Petri nets interpreted in a modeling language based on the notion of machines of things that flow. The semantics of several Petri net diagrams are analyzed in terms of flow of things. The results point to the viability of the approach for exploring the underlying assumptions of Petri nets.

Connected through hyperedge HE-1 (induced by source paper "five generic processes for behavior description in software engineering"):
  with members:
    - "existential ontology and thinging modeling in software engineering"
    - "toward maximum grip process modeling in software engineering"
    - "conceptual modeling of inventory management processes as a thinging machine"
    - "thinging machine applied to information leakage"
    - "thinging vs objectfying in software engineering"
    - "tracking systems as thinging machine a case study of a service company"
    - "conceptual modeling of a procurement process case study of rfp for public key infrastructure"
    - "thinging for software engineers"

Connected through hyperedge HE-2 (induced by source paper "toward maximum grip process modeling in software engineering"):
  with members:
    - "existential ontology and thinging modeling in software engineering"
    - "conceptual modeling of inventory management processes as a thinging machine"
    - "thinging machine applied to information leakage"
    - "thinging vs objectfying in software engineering"
    - "tracking systems as thinging machine a case study of a service company"
    - "conceptual modeling of a procurement process case study of rfp for public key infrastructure"
    - "thinging for software engineers"
    - "privacy things systematic approach to privacy and personal identifiable information"

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.SE(Software Engineering)