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: "open problems from cccg 2002"
  Abstract: A list of the problems presented on August 12, 2002 at the open-problem session of the 14th Canadian Conference on Computational Geometry held in Lethbridge, Alberta, Canada.

Connected through hyperedge HE-1 (induced by source paper "unfolding polyhedra"):
  with members:
    - "some polycubes have no edge unzipping"
    - "addendum to edge unfolding nearly flat convex caps"
    - "edge unfolding nearly flat convex caps"
    - "unfolding genus 2 orthogonal polyhedra with linear refinement"
    - "spiral unfoldings of convex polyhedra"
    - "existence of a polyhedron which does not have a non overlapping pseudo edge unfolding"
    - "a class of convex polyhedra with few edge unfoldings"
    - "unfolding orthogonal terrains"

Connected through hyperedge HE-2 (induced by source paper "unfolding manhattan towers"):
  with members:
    - "unfolding orthogonal terrains"

Connected through hyperedge HE-3 (induced by source paper "unfolding orthogonal terrains"):
  with members:
    - "unfolding manhattan towers"

Connected through hyperedge HE-4 (induced by source paper "epsilon unfolding orthogonal polyhedra"):
  with members:
    - "unfolding manhattan towers"
    - "grid vertex unfolding orthogonal polyhedra"
    - "vertex unfoldings of simplicial manifolds"

Connected through hyperedge HE-5 (induced by source paper "grid vertex unfolding orthogonal polyhedra"):
  with members:
    - "vertex unfoldings of simplicial manifolds"

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)