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: "an algorithmic framework for shape formation problems in self organizing particle systems"
  Abstract: Many proposals have already been made for realizing programmable matter, ranging from shape-changing molecules, DNA tiles, and synthetic cells to reconfigurable modular robotics. Envisioning systems of nano-sensors devices, we are particularly interested in programmable matter consisting of systems of simple computational elements, called particles, that can establish and release bonds and can actively move in a self-organized way, and in shape formation problems relevant for programmable matter in those self-organizing particle systems (SOPS). In this paper, we present a general algorithmic framework for shape formation problems in SOPS, and show direct applications of this framework to the problems of having the particle system self-organize to form a hexagonal or triangular shape. Our algorithms utilize only local control, require only constant-size memory particles, and are asymptotically optimal both in terms of the total number of movements needed to reach the desired shape configuration.

Connected through hyperedge HE-1 (induced by source paper "mobile ram and shape formation by programmable particles"):
  with members:
    - "a stochastic approach to shortcut bridging in programmable matter"
    - "on the runtime of universal coating for programmable matter"
    - "on the transformation capability of feasible mechanisms for programmable matter"
    - "turingmobile a turing machine of oblivious mobile robots with limited visibility and its applications"
    - "line recovery by programmable particles"
    - "shape formation by programmable particles"
    - "universal coating for programmable matter"
    - "terminating distributed construction of shapes and patterns in a fair solution of automata"

Connected through hyperedge HE-2 (induced by source paper "connected assembly and reconfiguration by finite automata"):
  with members:
    - "on the runtime of universal coating for programmable matter"
    - "cadbots algorithmic aspects of manipulating programmable matter with finite automata"
    - "shape formation by programmable particles"
    - "improved leader election for self organizing programmable matter"
    - "universal coating for programmable matter"
    - "new geometric algorithms for fully connected staged self assembly"
    - "leader election and shape formation with self organizing programmable matter"
    - "universal computation with arbitrary polyomino tiles in non cooperative self assembly"

Connected through hyperedge HE-3 (induced by source paper "deterministic leader election in programmable matter"):
  with members:
    - "distributed leader election and computation of local identifiers for programmable matter"
    - "a stochastic approach to shortcut bridging in programmable matter"
    - "on the runtime of universal coating for programmable matter"
    - "convex hull formation for programmable matter"
    - "line recovery by programmable particles"
    - "shape formation by programmable particles"
    - "improved leader election for self organizing programmable matter"
    - "universal coating for programmable matter"

Connected through hyperedge HE-4 (induced by source paper "pushing lines helps efficient universal centralised transformations for programmable matter"):
  with members:
    - "on the runtime of universal coating for programmable matter"
    - "on the transformation capability of feasible mechanisms for programmable matter"
    - "line recovery by programmable particles"
    - "shape formation by programmable particles"
    - "simple and efficient local codes for distributed stable network construction"
    - "active self assembly of algorithmic shapes and patterns in polylogarithmic time"
    - "the computational power of population protocols"
    - "pspace completeness of sliding block puzzles and other problems through the nondeterministic constraint logic model of computation"

Connected through hyperedge HE-5 (induced by source paper "on the runtime of universal coating for programmable matter"):
  with members:
    - "improved leader election for self organizing programmable matter"
    - "universal coating for programmable matter"
    - "leader election and shape formation with self organizing programmable matter"
    - "parallel computation using active self assembly"
    - "simple and efficient local codes for distributed stable network construction"
    - "active self assembly of algorithmic shapes and patterns in polylogarithmic time"
    - "intrinsic universality and the computational power of self assembly"
    - "physarum can compute shortest paths"

Connected through hyperedge HE-6 (induced by source paper "distributed leader election and computation of local identifiers for programmable matter"):
  with members:
    - "on the runtime of universal coating for programmable matter"
    - "line recovery by programmable particles"
    - "shape formation by programmable particles"
    - "improved leader election for self organizing programmable matter"
    - "universal coating for programmable matter"
    - "leader election and shape formation with self organizing programmable matter"

Connected through hyperedge HE-7 (induced by source paper "tilt assembly algorithms for micro factories that build objects with uniform external forces"):
  with members:
    - "coordinated motion planning reconfiguring a swarm of labeled robots with bounded stretch"
    - "collecting a swarm in a grid environment using shared global inputs"
    - "universal coating for programmable matter"
    - "optimal staged self assembly of general shapes"
    - "new geometric algorithms for fully connected staged self assembly"
    - "particle computation designing worlds to control robot swarms with only global signals"
    - "crowdsourcing swarm manipulation experiments a massive online user study with large swarms of simple robots"
    - "two hands are better than one up to constant factors"

Connected through hyperedge HE-8 (induced by source paper "shape formation by programmable particles"):
  with members:
    - "on the runtime of universal coating for programmable matter"
    - "on the transformation capability of feasible mechanisms for programmable matter"
    - "line recovery by programmable particles"
    - "improved leader election for self organizing programmable matter"
    - "universal coating for programmable matter"
    - "a markov chain algorithm for compression in self organizing particle systems"
    - "terminating distributed construction of shapes and patterns in a fair solution of automata"
    - "leader election and shape formation with self organizing programmable matter"

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.ET(Emerging Technologies)