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: "workspace and assembly modes in fully parallel manipulators a descriptive study"
  Abstract: The goal of this paper is to explain, using a typical example, the distribution of the different assembly modes in the workspace and their effective role in the execution of trajectories. The singular and non-singular changes of assembly mode are described and compared to each other. The non-singular change of assembly mode is more deeply analysed and discussed in the context of trajectory planning. In particular, it is shown that, according to the location of the initial and final configurations with respect to the uniqueness domains in the workspace, there are three different cases to consider before planning a linking trajectory.

Connected through hyperedge HE-1 (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"
    - "non singular assembly mode changing motions for 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"

Connected through hyperedge HE-2 (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:
    - "non singular assembly mode changing motions for 3 rpr parallel manipulators"
    - "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"

Connected through hyperedge HE-3 (induced by source paper "cuspidal and noncuspidal robot manipulators"):
  with members:
    - "non singular assembly mode changing motions for 3 rpr parallel manipulators"
    - "classification of one family of 3r positioning manipulators"
    - "a classification of 3r orthogonal manipulators by the topology of their workspace"
    - "an exhaustive study of the workspace topologies of all 3r orthogonal manipulators with geometric simplifications"

Connected through hyperedge HE-4 (induced by source paper "kinematic analysis of a class of analytic planar 3 rpr parallel manipulators"):
  with members:
    - "non singular assembly mode changing motions for 3 rpr parallel manipulators"
    - "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"

Connected through hyperedge HE-5 (induced by source paper "non singular assembly mode changing motions for 3 rpr parallel manipulators"):
  with members:
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"
    - "definition sets for the direct kinematics of parallel manipulators"
    - "an algorithm for computing cusp points in the joint space of 3 rpr 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"
    - "the kinematic analysis of a symmetrical three degree of freedom planar parallel manipulator"

Connected through hyperedge HE-6 (induced by source paper "changing assembly modes without passing parallel singularities in non cuspidal 3 r underline p r planar parallel robots"):
  with members:
    - "non singular assembly mode changing motions for 3 rpr parallel manipulators"

Connected through hyperedge HE-7 (induced by source paper "singular curves in the joint space and cusp points of 3 rpr parallel manipulators"):
  with members:
    - "definition sets for the direct kinematics of parallel manipulators"
    - "singular curves and cusp points in the joint space of 3 rpr parallel manipulators"
    - "a classification of 3r orthogonal manipulators by the topology of their workspace"

Connected through hyperedge HE-8 (induced by source paper "singularity surfaces and maximal singularity free boxes in the joint space of planar 3 rpr parallel manipulators"):
  with members:
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"
    - "definition sets for the direct kinematics of parallel manipulators"
    - "singular curves and cusp points in the joint space of 3 rpr parallel manipulators"

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)