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: "mapping patent classifications portfolio and statistical analysis and the comparison of strengths and weaknesses"
  Abstract: The Cooperative Patent Classifications (CPC) jointly developed by the European and US Patent Offices provide a new basis for mapping and portfolio analysis. This update provides an occasion for rethinking the parameter choices. The new maps are significantly different from previous ones, although this may not always be obvious on visual inspection. Since these maps are statistical constructs based on index terms, their quality--as different from utility--can only be controlled discursively. We provide nested maps online and a routine for portfolio overlays and further statistical analysis. We add a new tool for "difference maps" which is illustrated by comparing the portfolios of patents granted to Novartis and MSD in 2016.

Connected through hyperedge HE-1 (induced by source paper "interdisciplinarity as diversity in citation patterns among journals rao stirling diversity relative variety and the gini coefficient"):
  with members:
    - "creativity in science and the link to cited references is the creative potential of papers reflected in their cited references"
    - "diversity and interdisciplinarity how can one distinguish and recombine disparity variety and balance"
    - "betweenness and diversity in journal citation networks as measures of interdisciplinarity a tribute to eugene garfield"
    - "information metrics imetrics a research specialty with a socio cognitive identity"
    - "how journal rankings can suppress interdisciplinary research a comparison between innovation studies and business management"
    - "towards a new crown indicator some theoretical considerations"
    - "indicators of the interdisciplinarity of journals diversity centrality and citations"
    - "science overlay maps a new tool for research policy and library management"

Connected through hyperedge HE-2 (induced by source paper "diversity and interdisciplinarity how can one distinguish and recombine disparity variety and balance"):
  with members:
    - "betweenness and diversity in journal citation networks as measures of interdisciplinarity a tribute to eugene garfield"

Connected through hyperedge HE-3 (induced by source paper "patent portfolio analysis of cities statistics and maps of technological inventiveness"):
  with members:
    - "measuring technological distance for patent mapping"
    - "strategic intelligence on emerging technologies scientometric overlay mapping"
    - "journal portfolio analysis for countries cities and organizations maps and comparisons"

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)