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: "kleene algebras and semimodules for energy problems"
  Abstract: With the purpose of unifying a number of approaches to energy problems found in the literature, we introduce generalized energy automata. These are finite automata whose edges are labeled with energy functions that define how energy levels evolve during transitions. Uncovering a close connection between energy problems and reachability and B\"uchi acceptance for semiring-weighted automata, we show that these generalized energy problems are decidable. We also provide complexity results for important special cases.

Connected through hyperedge HE-1 (induced by source paper "featured weighted automata"):
  with members:
    - "long term average cost in featured transition systems"
    - "continuous kleene ω algebras for energy problems"
    - "energy parity games"

Connected through hyperedge HE-2 (induced by source paper "an omega algebra for real time energy problems"):
  with members:
    - "continuous kleene ω algebras for energy problems"

Connected through hyperedge HE-3 (induced by source paper "well behaved transition systems"):
  with members:
    - "reachability in two dimensional vector addition systems with states is pspace complete"
    - "context free commutative grammars with integer counters and resets"
    - "fixed dimensional energy games are in pseudo polynomial time"
    - "integer vector addition systems with states"
    - "the power of well structured systems"
    - "forward analysis for wsts part ii complete wsts"
    - "multiply recursive upper bounds with higman s lemma"
    - "forward analysis for wsts part i completions"

Connected through hyperedge HE-4 (induced by source paper "continuous kleene ω algebras for energy problems"):
  with members:
    - "the complexity of multi mean payoff and multi energy games"
    - "energy parity games"

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)