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: "non singular assembly mode changing motions for 3 rpr parallel manipulators"
  Abstract: When moving from one arbitrary location at another, a parallel manipulator may change its assembly-mode without crossing a singularity. Because the non-singular change of assembly-mode cannot be simply detected, the actual assembly-mode during motion is difficult to track. This paper proposes a global explanatory approach to help better understand non-singular assembly-mode changing motions for 3-RPR planar parallel manipulators. The approach consists in fixing one of the actuated joints and analyzing the configuration-space as a surface in a 3-dimensional space. Such a global description makes it possible to display all possible non-singular assembly-mode changing trajectories.

Connected through hyperedge HE-1 (induced by source paper "non singular assembly mode changing trajectories in the workspace for the 3 rps parallel robot"):
  with members:
    - "uniqueness domains and non singular assembly mode changing trajectories"
    - "on the determination of cusp points of 3 rpr parallel manipulators"
    - "definition sets for the direct kinematics of parallel manipulators"

Connected through hyperedge HE-2 (induced by source paper "singular surfaces and cusps in symmetric planar 3 rpr manipulators"):
  with members:
    - "kinematic analysis of a class of analytic planar 3 rpr parallel manipulators"
    - "definition sets for the direct kinematics of parallel manipulators"
    - "degeneracy study of the forward kinematics of planar 3 rpr parallel manipulators"
    - "singular curves and cusp points in the joint space of 3 rpr parallel manipulators"
    - "workspace and assembly modes in fully parallel manipulators a descriptive study"

Connected through hyperedge HE-3 (induced by source paper "a study of the singularity locus in the joint space of planar parallel manipulators special focus on cusps and nodes"):
  with members:
    - "definition sets for the direct kinematics of parallel manipulators"
    - "an algorithm for computing cusp points in the joint space of 3 rpr parallel manipulators"
    - "singular curves and cusp points in the joint space of 3 rpr parallel manipulators"
    - "workspace and assembly modes in fully parallel manipulators a descriptive study"

Connected through hyperedge HE-4 (induced by source paper "uniqueness domains and non singular assembly mode changing trajectories"):
  with members:
    - "definition sets for the direct kinematics of parallel manipulators"

Connected through hyperedge HE-5 (induced by source paper "cuspidal and noncuspidal robot manipulators"):
  with members:
    - "classification of one family of 3r positioning manipulators"
    - "a classification of 3r orthogonal manipulators by the topology of their workspace"
    - "workspace and assembly modes in fully parallel manipulators a descriptive study"
    - "an exhaustive study of the workspace topologies of all 3r orthogonal manipulators with geometric simplifications"

Connected through hyperedge HE-6 (induced by source paper "kinematic analysis of a class of analytic planar 3 rpr parallel manipulators"):
  with members:
    - "singular curves in the joint space and cusp points of 3 rpr parallel manipulators"
    - "degeneracy study of the forward kinematics of planar 3 rpr parallel manipulators"
    - "workspace and assembly modes in fully parallel manipulators a descriptive study"

Connected through hyperedge HE-7 (induced by source paper "changing assembly modes without passing parallel singularities in non cuspidal 3 r underline p r planar parallel robots"):
  with members:
    - "workspace and assembly modes in fully parallel manipulators a descriptive study"

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.RO(Robotics)