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: "press f1 for help participatory design for dealing with on line and real life security of older adults"
  Abstract: In this paper we present the report on the design and development of a platform for the inter-generational exchange of favors. This platform was designed using participatory design approach during a 24-hour hackathon by a team consisting of younger programmers and older adults. The findings of this report show that inter-generational cooperation in which the older adults serve as representatives of the end user, not only improves the design and development of the application, but also provides an effective method for designing and applying solutions aimed at improving the security of older adults while using online and mobile tools.

Connected through hyperedge HE-1 (induced by source paper "vr with older adults participatory design of a virtual atm training simulation"):
  with members:
    - "older adults and voice interaction a pilot study with google home"
    - "older adults and crowdsourcing android tv app for evaluating tedx subtitle quality"
    - "guidelines towards better participation of older adults in software development processes using a new spiral method and participatory approach"
    - "a location based game for two generations teaching mobile technology to the elderly with the support of young volunteers"
    - "beyond participatory design towards a model for teaching seniors application design"
    - "livinglab pjait towards better urban participation of seniors"

Connected through hyperedge HE-2 (induced by source paper "older adults and crowdsourcing android tv app for evaluating tedx subtitle quality"):
  with members:
    - "guidelines towards better participation of older adults in software development processes using a new spiral method and participatory approach"
    - "from close the door to do not click and back security by design for older adults"
    - "turned 70 it is time to start editing wikipedia"
    - "a location based game for two generations teaching mobile technology to the elderly with the support of young volunteers"
    - "beyond participatory design towards a model for teaching seniors application design"
    - "livinglab pjait towards better urban participation of seniors"
    - "emotions make cities live towards mapping emotions of older adults on urban space"

Connected through hyperedge HE-3 (induced by source paper "from close the door to do not click and back security by design for older adults"):
  with members:
    - "turned 70 it is time to start editing wikipedia"
    - "a location based game for two generations teaching mobile technology to the elderly with the support of young volunteers"
    - "livinglab pjait towards better urban participation of seniors"
    - "emotions make cities live towards mapping emotions of older adults on urban space"

Connected through hyperedge HE-4 (induced by source paper "golden years golden shores a study of elders in online travel communities"):
  with members:
    - "turned 70 it is time to start editing wikipedia"
    - "a location based game for two generations teaching mobile technology to the elderly with the support of young volunteers"
    - "livinglab pjait towards better urban participation of seniors"
    - "senior programmers characteristics of elderly users from stack overflow"

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.SI(Social and Information Networks)