human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "a study of the singularity locus in the joint space of planar parallel manipulators special focus on cusps and nodes"):
  Abstract: Cusps and nodes on plane sections of the singularity locus in the joint space of parallel manipulators play an important role in nonsingular assembly-mode changing motions. This paper analyses in detail such points, both in the joint space and in the workspace. It is shown that a cusp (resp. a node) defines a point of tangency (resp. a crossing point) in the workspace between the singular curves and the curves associated with the so-called characteristics surfaces. The study is conducted on a planar 3-RPR manipulator for illustrative purposes.

Includes members:
  Member "non singular assembly mode changing motions for 3 rpr parallel manipulators":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "non singular assembly mode changing trajectories in the workspace for the 3 rps parallel robot")
  Member "definition sets for the direct kinematics of parallel manipulators":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "non singular assembly mode changing trajectories in the workspace for the 3 rps parallel robot")
  Member "an algorithm for computing cusp points in the joint space of 3 rpr parallel manipulators":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "non singular assembly mode changing motions for 3 rpr parallel manipulators")
  Member "singular curves and cusp points in the joint space of 3 rpr parallel manipulators":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "singular surfaces and cusps in symmetric planar 3 rpr manipulators")
  Member "workspace and assembly modes in fully parallel manipulators a descriptive study":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "singular surfaces and cusps in symmetric planar 3 rpr manipulators")

Question: Please tell me which class the source paper 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)