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: "openjml software verification for java 7 using jml openjdk and eclipse"
  Abstract: OpenJML is a tool for checking code and specifications of Java programs. We describe our experience building the tool on the foundation of JML, OpenJDK and Eclipse, as well as on many advances in specification-based software verification. The implementation demonstrates the value of integrating specification tools directly in the software development IDE and in automating as many tasks as possible. The tool, though still in progress, has now been used for several college-level courses on software specification and verification and for small-scale studies on existing Java programs. 1 Introduction to OpenJML OpenJML is a tool for verification (checking consistency of code and specifications) of Java programs. It is an implementation of the Java Modeling Language (JML) [29, 32] and is built using the OpenJDK [46] compiler. OpenJML can be used both as a command-line tool and through a GUI built on Eclipse. The tool has been under development in bursts since 2009. Initially the project was simply an experiment to see whether OpenJDK would make a good replacement for the custom parser that underlies ESC/Java(2) [37, 16] and the MultiJava compiler that underlies the JML2 tools, neither of which implemented Java generics. The development was reinvigorated in 2011 and is now supporting academic and trial users and staying current with developments in Java. OpenJML’s long-term goal is to provide an IDE for managing program specifications that naturally fits into the practice of daily software development and so becomes a part of expected software engineering practice. To that end, the project has several nearer-term objectives, discussed in more detail in the body of this paper: To create an implementation of JML, replacing ESC/Java2; To provide a tool that can be used in courses and tutorials on software specification and verification; To provide an integration of many techniques proposed in the software verification research or implemented as standalone proofs of concept over the past few decades; To be a platform for experimentation: ‐ with specification language features ‐ with specification encodings ‐ with SMT solvers on software verification problems To enable case studies of verification of industrial software; Eventually, to be a tool to be used in daily, industrial software development. OpenJML includes operations for a number of related tasks: parsing and typechecking of JML in conjunction with the corresponding Java code static checking of code and specifications. OpenJML translates Java + JML specifications into verification conditions that are then checked by SMT solvers.

Connected through hyperedge HE-1 (induced by source paper "verifying openjdk s linkedlist using key"):
  with members:
    - "experience report on formally verifying parts of openjdk s api with key"
    - "lessons learned from microkernel verification specification is the new bottleneck"

Connected through hyperedge HE-2 (induced by source paper "rpp automatic proof of relational properties by self composition"):
  with members:
    - "the dafny integrated development environment"

Connected through hyperedge HE-3 (induced by source paper "formal reasoning using an iterative approach with an integrated web ide"):
  with members:
    - "who watches the watchers validating the prob validation tool"
    - "teaching formal methods and discrete mathematics"
    - "proceedings 1st workshop on formal integrated development environment"
    - "speedy an eclipse based ide for invariant inference"
    - "checking computations of formal method tools a secondary toolchain for prob"
    - "focalize inside an f ide"
    - "the dafny integrated development environment"
    - "verifying eiffel programs with boogie"

Connected through hyperedge HE-4 (induced by source paper "the dafny integrated development environment"):
  with members:
    - "getting started with isabelle jedit"
    - "edit and verify"

Connected through hyperedge HE-5 (induced by source paper "speedy an eclipse based ide for invariant inference"):
  with members:
    - "the dafny integrated development environment"

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)