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: "approximating the minimum length of synchronizing words is hard"
  Abstract: We prove that, unless P=NP, no polynomial-time algorithm can approximate the minimum length of synchronizing words for a given synchronizing automaton within a constant factor.

Connected through hyperedge HE-1 (induced by source paper "finding dfas with maximal shortest synchronizing word length"):
  with members:
    - "primitive digraphs with large exponents and slowly synchronizing automata"
    - "the cerny conjecture for one cluster automata with prime length cycle"

Connected through hyperedge HE-2 (induced by source paper "checking whether an automaton is monotonic is np complete"):
  with members:
    - "on nonpermutational transformation semigroups with an application to syntactic complexity"
    - "synchronizing automata with large reset lengths"
    - "large aperiodic semigroups"
    - "experimental study of the shortest reset word of random automata"
    - "the complexity of finding reset words in finite automata"
    - "decision problems for convex languages"

Connected through hyperedge HE-3 (induced by source paper "reachability of consensus and synchronizing automata"):
  with members:
    - "on the synchronizing probability function and the triple rendezvous time for synchronizing automata"
    - "efficient algorithms for the consensus decision problem"
    - "p l aying for synchronization"
    - "the road coloring problem"

Connected through hyperedge HE-4 (induced by source paper "algebraic synchronization criterion and computing reset words"):
  with members:
    - "experiments with synchronizing automata"
    - "fast synchronization of random automata"
    - "synchronizing automata with large reset lengths"
    - "strong inapproximability of the shortest reset word"
    - "primitive digraphs with large exponents and slowly synchronizing automata"
    - "on the probability to be synchronizable"
    - "on two algorithmic problems about synchronizing automata"
    - "on the probability of being synchronizable"

Connected through hyperedge HE-5 (induced by source paper "testing for synchronization"):
  with members:
    - "on the probability to be synchronizable"
    - "on two algorithmic problems about synchronizing automata"
    - "on the probability of being synchronizable"
    - "the complexity of finding reset words in finite automata"
    - "the road coloring problem"

Connected through hyperedge HE-6 (induced by source paper "subset synchronization and careful synchronization of binary finite automata"):
  with members:
    - "complexity of a problem concerning reset words for eulerian binary automata"
    - "modifying the upper bound on the length of minimal synchronizing word"
    - "the road coloring problem"

Connected through hyperedge HE-7 (induced by source paper "subset synchronization of transitive automata"):
  with members:
    - "modifying the upper bound on the length of minimal synchronizing word"
    - "the complexity of finding reset words in finite automata"
    - "the cerny conjecture for one cluster automata with prime length cycle"

Connected through hyperedge HE-8 (induced by source paper "strong inapproximability of the shortest reset word"):
  with members:
    - "on two algorithmic problems about synchronizing automata"
    - "the complexity of finding reset words in finite automata"
    - "the cerny conjecture for one cluster automata with prime length cycle"

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)