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: "how much of the web is archived"
  Abstract: Although the Internet Archive's Wayback Machine is the largest and most well-known web archive, there have been a number of public web archives that have emerged in the last several years. With varying resources, audiences and collection development policies, these archives have varying levels of overlap with each other. While individual archives can be measured in terms of number of URIs, number of copies per URI, and intersection with other archives, to date there has been no answer to the question "How much of the Web is archived?" We study the question by approximating the Web using sample URIs from DMOZ, Delicious, Bitly, and search engine indexes; and, counting the number of copies of the sample URIs exist in various public web archives. Each sample set provides its own bias. The results from our sample sets indicate that range from 35%-90% of the Web has at least one archived copy, 17%-49% has between 2-5 copies, 1%-8% has 6-10 copies, and 8%-63% has more than 10 copies in public web archives. The number of URI copies varies as a function of time, but no more than 31.3% of URIs are archived more than once per month.

Connected through hyperedge HE-1 (induced by source paper "making recommendations from web archives for lost web pages"):
  with members:
    - "how to search the internet archive without indexing it"
    - "who and what links to the internet archive"
    - "access patterns for robots and humans in web archives"

Connected through hyperedge HE-2 (induced by source paper "understanding web archiving services and their mis use on social media"):
  with members:
    - "consumers and curators browsing and voting patterns on reddit"
    - "hate is not binary studying abusive behavior of gamergate on twitter"
    - "kek cucks and god emperor trump a measurement study of 4chan s politically incorrect forum and its effects on the web"
    - "the dawn of today s popular domains a study of the archived german web over 18 years"
    - "gone in six characters short urls considered harmful for cloud services"
    - "adscape harvesting and analyzing online display ads"
    - "who and what links to the internet archive"

Connected through hyperedge HE-3 (induced by source paper "archiving software surrogates on the web for future reference"):
  with members:
    - "tempas temporal archive search based on tags"
    - "on the applicability of delicious for temporal search on web archives"
    - "the dawn of today s popular domains a study of the archived german web over 18 years"
    - "archivespark efficient web archive access extraction and derivation"
    - "best practices for scientific computing"
    - "swmath a new information service for mathematical software"
    - "profiling web archive coverage for top level domain and content language"
    - "losing my revolution how many resources shared on social media have been lost"

Connected through hyperedge HE-4 (induced by source paper "linking mathematical software in web archives"):
  with members:
    - "tempas temporal archive search based on tags"
    - "the dawn of today s popular domains a study of the archived german web over 18 years"
    - "swmath a new information service for mathematical software"

Connected through hyperedge HE-5 (induced by source paper "quantifying orphaned annotations in hypothes is"):
  with members:
    - "resurrecting my revolution using social link neighborhood in bringing context to the disappearing web"
    - "designing the w3c open annotation data model"
    - "losing my revolution how many resources shared on social media have been lost"
    - "open annotations on multimedia web resources"
    - "the open annotation collaboration oac model"
    - "sharedcanvas a collaborative model for medieval manuscript layout dissemination"
    - "making web annotations persistent over time"
    - "memento time travel for the web"

Connected through hyperedge HE-6 (induced by source paper "support for various http methods on the web"):
  with members:
    - "http mailbox asynchronous restful communication"

Connected through hyperedge HE-7 (induced by source paper "mapping the uk webspace fifteen years of british universities on the web"):
  with members:
    - "a brief history of the internet"

Connected through hyperedge HE-8 (induced by source paper "evaluating sliding and sticky target policies by measuring temporal drift in acyclic walks through a web archive"):
  with members:
    - "access patterns for robots and humans in web archives"
    - "profiling web archive coverage for top level domain and content language"
    - "evaluating the sitestory transactional web archive with the apachebench tool"
    - "an http based versioning mechanism for linked data"
    - "memento time travel for the web"
    - "characterization of search engine caches"

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.DL(Digital Libraries)