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: "verified type checker for jolie programming language"
  Abstract: Jolie is a service-oriented programming language which comes with the formal specification of its type system. However, there is no tool to ensure that programs in Jolie are well-typed. In this paper we provide the results of building a type checker for Jolie as a part of its syntax and semantics formal model. We express the type checker as a program with dependent types in Agda proof assistant which helps to ascertain that the type checker is correct.

Connected through hyperedge HE-1 (induced by source paper "microservices science and engineering"):
  with members:
    - "microservices a language based approach"
    - "jolie static type checker a prototype"
    - "microservices how to make your application scale"
    - "microservices yesterday today and tomorrow"
    - "refinement types in jolie"
    - "jolie coog buildings internet of things for smart building infrastructure supporting concurrent apps utilizing distibuted microservices"
    - "jolie community on the rise"
    - "process aware web programming with jolie"

Connected through hyperedge HE-2 (induced by source paper "jolie static type checker a prototype"):
  with members:
    - "microservices how to make your application scale"
    - "towards microservices and beyond an incoming paradigm shift in distributed computing"
    - "jolie coog buildings internet of things for smart building infrastructure supporting concurrent apps utilizing distibuted microservices"
    - "jolie community on the rise"

Connected through hyperedge HE-3 (induced by source paper "microservices yesterday today and tomorrow"):
  with members:
    - "jolie static type checker a prototype"
    - "microservices how to make your application scale"
    - "jolie community on the rise"
    - "process aware web programming with jolie"

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)