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: "initial findings from a study of best practices and models for cyberinfrastructure software sustainability"
  Abstract: We present a set of common themes and recommendations extracted from in depth interviews with the leaders of 12 distinct cyberinfrastructure software projects. These interviews were conducted as part of a larger study to identify and elucidate the best practices and management models that lead to sustainability for cyberinfrastructure software. Respondents in a formal survey of cyberinfrastructure users identified these projects as good examples of sustained software initiatives. While there is clearly no single method or plan that will guarantee sustainability for all projects, we can draw general guidance from these exemplars. This paper presents the common themes, ideas, and recommendations that emerged from those interviews.

Connected through hyperedge HE-1 (induced by source paper "software search is not a science even among scientists a survey of how scientists and engineers find software"):
  with members:
    - "the challenge and promise of software citation for credit identification discovery and reuse"
    - "looking at software sustainability and productivity challenges from nsf"
    - "swmath a new information service for mathematical software"
    - "the numpy array a structure for efficient numerical computation"

Connected through hyperedge HE-2 (induced by source paper "software search is not a science even among scientists"):
  with members:
    - "the challenge and promise of software citation for credit identification discovery and reuse"
    - "lightning talk report on software metrics for research software"
    - "looking at software sustainability and productivity challenges from nsf"
    - "swmath a new information service for mathematical software"
    - "the numpy array a structure for efficient numerical computation"

Connected through hyperedge HE-3 (induced by source paper "summary of the first workshop on sustainable software for science practice and experiences wssspe1"):
  with members:
    - "experiences from software engineering of large scale amr multiphysics code frameworks"
    - "software abstractions and methodologies for hpc simulation codes on future architectures"
    - "transitive credit as a means to address social and technological concerns stemming from citation and attribution of digital products"
    - "sustainable software development for next gen sequencing ngs bioinformatics on emerging platforms"
    - "experiences with automated build and test for geodynamics simulation codes"
    - "cactus issues for sustainable simulation software"
    - "sustainable software ecosystems for open science"
    - "visit experiences with sustainable software"

Connected through hyperedge HE-4 (induced by source paper "first workshop on on sustainable software for science practice and experiences wssspe submission and peer review process and results"):
  with members:
    - "software abstractions and methodologies for hpc simulation codes on future architectures"
    - "sustainable software development for next gen sequencing ngs bioinformatics on emerging platforms"
    - "experiences with automated build and test for geodynamics simulation codes"
    - "cactus issues for sustainable simulation software"
    - "sustainable software ecosystems for open science"
    - "visit experiences with sustainable software"
    - "simplifying the development use and sustainability of hpc software"
    - "enabling reproducible science with vistrails"

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)