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: "delta confluent drawings"
  Abstract: We generalize the tree-confluent graphs to a broader class of graphs called Delta-confluent graphs. This class of graphs and distance-hereditary graphs, a well-known class of graphs, coincide. Some results about the visualization of Delta-confluent graphs are also given.

Connected through hyperedge HE-1 (induced by source paper "on strict outer confluent graphs"):
  with members:
    - "strict confluent drawing"
    - "confluent hasse diagrams"
    - "split decomposition and graph labelled trees characterizations and fully dynamic algorithms for totally decomposable graphs"
    - "confluent layered drawings"
    - "confluent drawings visualizing non planar diagrams in a planar way"

Connected through hyperedge HE-2 (induced by source paper "further towards unambiguous edge bundling investigating power confluent drawings for network visualization"):
  with members:
    - "graph drawing by stochastic gradient descent"
    - "strict confluent drawing"
    - "improved optimal and approximate power graph compression for clearer visualisation of dense graphs"
    - "confluent layered drawings"
    - "confluent drawings visualizing non planar diagrams in a planar way"

Connected through hyperedge HE-3 (induced by source paper "strict confluent drawing"):
  with members:
    - "confluent hasse diagrams"
    - "confluent layered drawings"
    - "confluent drawings visualizing non planar diagrams in a planar way"

Connected through hyperedge HE-4 (induced by source paper "confluent hasse diagrams"):
  with members:
    - "confluent layered drawings"
    - "confluent drawings visualizing non planar diagrams in a planar way"

Connected through hyperedge HE-5 (induced by source paper "practical and efficient split decomposition via graph labelled trees"):
  with members:
    - "practical and efficient circle graph recognition"
    - "split decomposition and graph labelled trees characterizations and fully dynamic algorithms for totally decomposable graphs"
    - "the monadic second order logic of graphs xvi canonical graph decompositions"
    - "extending the theory of owicki and gries with a logic of progress"

Connected through hyperedge HE-6 (induced by source paper "split decomposition and graph labelled trees characterizations and fully dynamic algorithms for totally decomposable graphs"):
  with members:
    - "a note on computing set overlap classes"
    - "the monadic second order logic of graphs xvi canonical graph decompositions"
    - "linear encodings of bounded ltl model checking"

Connected through hyperedge HE-7 (induced by source paper "upright quad drawing of st planar learning spaces"):
  with members:
    - "happy endings for flip graphs"
    - "the lattice dimension of a graph"
    - "algorithms for drawing media"

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.CG(Computational Geometry)