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: "real time planning with primitives for dynamic walking over uneven terrain"
  Abstract: We present an algorithm for receding-horizon motion planning using a finite family of motion primitives for underactuated dynamic walking over uneven terrain. The motion primitives are defined as virtual holonomic constraints, and the special structure of underactuated mechanical systems operating subject to virtual constraints is used to construct closed-form solutions and a special binary search tree that dramatically speed up motion planning. We propose a greedy depth-first search and discuss improvement using energy-based heuristics. The resulting algorithm can plan several footsteps ahead in a fraction of a second for both the compass-gait walker and a planar 7-Degree-of-freedom/five-link walker.

Connected through hyperedge HE-1 (induced by source paper "a planning and control framework for humanoid systems robust optimal and real time performance"):
  with members:
    - "robot impedance control and passivity analysis with inner torque and velocity feedback loops"
    - "momentum control with hierarchical inverse dynamics on a torque controlled humanoid"
    - "funnel libraries for real time robust feedback motion planning"
    - "a framework for planning and controlling non periodic bipedal locomotion"
    - "stability and performance limits of latency prone distributed feedback controllers"
    - "full body collision detection and reaction with omnidirectional mobile platforms a step towards safe human robot interaction"
    - "controlit a software framework for whole body operational space control"
    - "zmp support areas for multi contact mobility under frictional constraints"

Connected through hyperedge HE-2 (induced by source paper "robust optimal planning and control of non periodic bipedal locomotion with a centroidal momentum model"):
  with members:
    - "multi contact walking pattern generation based on model preview control of 3d com accelerations"

Connected through hyperedge HE-3 (induced by source paper "multi contact walking pattern generation based on model preview control of 3d com accelerations"):
  with members:
    - "stability of surface contacts for humanoid robots closed form formulae of the contact wrench cone for rectangular support areas"
    - "trajectory generation for multi contact momentum control"
    - "zmp support areas for multi contact mobility under frictional constraints"

Connected through hyperedge HE-4 (induced by source paper "a new time projecting controller based on 3lp model to recover intermittent pushes"):
  with members:
    - "3lp a linear 3d walking model including torso and swing dynamics"
    - "an efficiently solvable quadratic program for stabilizing dynamic locomotion"

Connected through hyperedge HE-5 (induced by source paper "3lp a linear 3d walking model including torso and swing dynamics"):
  with members:
    - "an efficiently solvable quadratic program for stabilizing dynamic locomotion"

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.SY(Systems and Control)