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 to morph planar graph drawings"
  Abstract: Given an $n$-vertex graph and two straight-line planar drawings of the graph that have the same faces and the same outer face, we show that there is a morph (i.e., a continuous transformation) between the two drawings that preserves straight-line planarity and consists of $O(n)$ steps, which we prove is optimal in the worst case. Each step is a unidirectional linear morph, which means that every vertex moves at constant speed along a straight line, and the lines are parallel although the vertex speeds may differ. Thus we provide an efficient version of Cairns' 1944 proof of the existence of straight-line planarity-preserving morphs for triangulated graphs, which required an exponential number of steps.

Connected through hyperedge HE-1 (induced by source paper "how to morph a tree on a small grid"):
  with members:
    - "upward planar morphs"
    - "pole dancing 3d morphs for tree drawings"
    - "optimal morphs of planar orthogonal drawings"
    - "optimal morphs of convex drawings"
    - "morphing schnyder drawings of planar triangulations"
    - "morphing planar graph drawings optimally"
    - "drawing graphs in the plane with a prescribed outer face and polynomial area"

Connected through hyperedge HE-2 (induced by source paper "morphing contact representations of graphs"):
  with members:
    - "upward planar morphs"
    - "optimal morphs of planar orthogonal drawings"
    - "square contact representations of partial 2 trees and triconnected simply nested graphs"
    - "optimal morphs of convex drawings"
    - "on self approaching and increasing chord drawings of 3 connected planar graphs"

Connected through hyperedge HE-3 (induced by source paper "upward planar morphs"):
  with members:
    - "optimal morphs of convex drawings"
    - "morphing planar graph drawings with unidirectional moves"
    - "morphing planar graph drawings optimally"

Connected through hyperedge HE-4 (induced by source paper "pole dancing 3d morphs for tree drawings"):
  with members:
    - "tree drawings revisited"
    - "morphing planar graph drawings with unidirectional moves"
    - "morphing planar graph drawings optimally"

Connected through hyperedge HE-5 (induced by source paper "convexity increasing morphs of planar graphs"):
  with members:
    - "optimal morphs of convex drawings"
    - "powers of tensors and fast matrix multiplication"

Connected through hyperedge HE-6 (induced by source paper "optimal morphs of planar orthogonal drawings"):
  with members:
    - "orthogonal graph drawing with inflexible edges"
    - "compatible connectivity augmentation of planar disconnected graphs"

Connected through hyperedge HE-7 (induced by source paper "morphing schnyder drawings of planar triangulations"):
  with members:
    - "morphing planar graph drawings with unidirectional moves"
    - "morphing planar graph drawings optimally"
    - "algorithms for sampling 3 orientations of planar triangulations"
    - "area universal rectangular layouts"

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)