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: "decidability of weak simulation on one counter nets"
  Abstract: One-counter nets (OCN) are Petri nets with exactly one unbounded place. They are equivalent to a subclass of one-counter automata with only a weak test for zero. We show that weak simulation preorder is decidable for OCN and that weak simulation approximants do not converge at level omega, but only at omega^2. In contrast, other semantic relations like weak bisimulation are undecidable for OCN, and so are weak (and strong) trace inclusion.

Connected through hyperedge HE-1 (induced by source paper "simulation problems over one counter nets"):
  with members:
    - "infinite state energy games"
    - "simulation over one counter nets is pspace complete"
    - "beyond language equivalence on visibly pushdown automata"
    - "equivalence checking on infinite state systems techniques and results"

Connected through hyperedge HE-2 (induced by source paper "shortest paths in one counter systems"):
  with members:
    - "demystifying reachability in vector addition systems"
    - "equivalence of deterministic one counter automata is nl complete"
    - "upper bounds for newton s method on monotone polynomial systems and p time model checking of probabilistic one counter automata"
    - "automata and reduced words in the free group"

Connected through hyperedge HE-3 (induced by source paper "trace inclusion for one counter nets revisited"):
  with members:
    - "reachability in two dimensional vector addition systems with states is pspace complete"
    - "equivalence of deterministic one counter automata is nl complete"
    - "simulation over one counter nets is pspace complete"
    - "ackermannian and primitive recursive bounds with dickson s lemma"
    - "ltl with the freeze quantifier and register automata"

Connected through hyperedge HE-4 (induced by source paper "simulation over one counter nets is pspace complete"):
  with members:
    - "beyond language equivalence on visibly pushdown automata"
    - "equivalence checking on infinite state systems techniques and results"

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.FL(Formal Languages and Automata Theory)