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: "turned 70 it is time to start editing wikipedia"
  Abstract: Success of Wikipedia would not be possible without the contributions of millions of anonymous Internet users who edit articles, correct mistakes, add links or pictures. At the same time Wikipedia editors are currently overworked and there is always more tasks waiting to be completed than people willing to volunteer. The paper explores the possibility of involving the elderly in the Wikipedia editing process. Older adults were asked to complete various tasks on Wikipedia. Based on the observations made during these activities as well as in-depth interviews, a list of recommendation has been crafted. It turned out that older adults are willing to contribute to Wikiepdia but substantial changes have to be made in the Wikipedia editor.

Connected through hyperedge HE-1 (induced by source paper "technologies for promoting social participation in later life"):
  with members:
    - "designing for co located and virtual social interactions in residential care"
    - "agile development for vulnerable populations lessons learned and recommendations"
    - "golden years golden shores a study of elders in online travel communities"
    - "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"
    - "online group exercises for older adults of different physical abilities"

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"
    - "press f1 for help participatory design for dealing with on line and real life security of older adults"
    - "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 "guidelines towards better participation of older adults in software development processes using a new spiral method and participatory approach"):
  with members:
    - "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-4 (induced by source paper "from close the door to do not click and back security by design for older adults"):
  with members:
    - "press f1 for help participatory design for dealing with on line and real life security of older adults"
    - "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-5 (induced by source paper "golden years golden shores a study of elders in online travel communities"):
  with members:
    - "press f1 for help participatory design for dealing with on line and real life security of older adults"
    - "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.HC(Human-Computer Interaction)