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: "multirobot cliff climbing on low gravity environments"
  Abstract: Exploration of extreme environments, including caves, canyons and cliffs on low-gravity surfaces such as the Moon, Mars and asteroids can provide insight into the geological history of the solar system, origins of water, life and prospect for future habitation and resource exploitation. Current methods of exploration utilize large rovers that are unsuitable for exploring these extreme environments. In this work, we analyze the feasibility of small, low-cost, reconfigurable multirobot systems to climb steep cliffs and canyon walls. Each robot is a 30-cm sphere covered in microspines for gripping onto rugged surfaces and attaches to several robots using a spring-tether. Even if one robot were to slip and fall, the system would be held up with multiple attachment points much like a professional alpine climber. We analyzed and performed detailed simulations of the design configuration space to identify an optimal system design that trades off climbing performance with risk of falling. Our results identify a system of 4 robots is best suited when enabling single-robot climbs, while a system of 6 robots are suited when two robots climb simultaneously. The results show a pathway towards demonstration of the system on real robots.

Connected through hyperedge HE-1 (induced by source paper "automated multidisciplinary design and control of hopping robots for exploration of extreme environments on the moon and mars"):
  with members:
    - "flying hopping pit bots for cave and lava tube exploration on the moon and mars"
    - "gnc of the spherex robot for extreme environment exploration on mars"

Connected through hyperedge HE-2 (induced by source paper "coordination and control of multiple climbing robots in transport of heavy loads through extreme terrain"):
  with members:
    - "planning and navigation of climbing robots in low gravity environments"
    - "flying hopping pit bots for cave and lava tube exploration on the moon and mars"
    - "guidance navigation and control of multirobot systems in cooperative cliff climbing"
    - "autonomous multirobot excavation for lunar applications"

Connected through hyperedge HE-3 (induced by source paper "planning and navigation of climbing robots in low gravity environments"):
  with members:
    - "guidance navigation and control of multirobot systems in cooperative cliff climbing"
    - "autonomous multirobot excavation for lunar applications"
    - "network of nano landers for in situ characterization of asteroid impact studies"

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)