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: "classical and quantum realtime alternating automata"
  Abstract: We present some new results on realtime classical and quantum alternating models. Firstly, we show that the emptiness problem for alternating one-counter automata on unary alphabets is undecidable. Then, we define realtime private alternating finite automata (PAFAs) and show that they can recognize some non-regular unary languages, and the emptiness problem is undecidable for them. Moreover, PAFAs augmented with a counter can recognize the unary squares language, which seems to be difficult even for some classical counter automata with two-way input. For quantum finite automata (QFAs), we show that the emptiness problem for universal QFAs on general alphabets and alternating QFAs with two alternations on unary alphabets are undecidable. On the other hand, the same problem is decidable for nondeterministic QFAs on general alphabets. We also show that the unary squares language is recognized by alternating QFAs with two alternations.

Connected through hyperedge HE-1 (induced by source paper "quantum finite automata survey status and research directions"):
  with members:
    - "unary probabilistic and quantum automata on promise problems"
    - "power of the interactive proof systems with verifiers modeled by semi quantum two way finite automata"
    - "promise problems solved by quantum and classical finite automata"
    - "magic coins are useful for small space quantum machines"
    - "debates with small transparent quantum verifiers"
    - "from quantum query complexity to state complexity"
    - "quantum finite automata a modern introduction"
    - "on the state complexity of semi quantum finite automata"

Connected through hyperedge HE-2 (induced by source paper "postselecting probabilistic finite state recognizers and verifiers"):
  with members:
    - "uncountable realtime probabilistic classes"
    - "uncountable classical and quantum complexity classes"
    - "magic coins are useful for small space quantum machines"
    - "probabilistic and quantum finite automata with postselection"
    - "computation with narrow ctcs"

Connected through hyperedge HE-3 (induced by source paper "decision problems on unary probabilistic and quantum automata"):
  with members:
    - "on the positivity problem for simple linear recurrence sequences"
    - "ultimate positivity is decidable for simple linear recurrence sequences"
    - "positivity problems for low order linear recurrence sequences"

Connected through hyperedge HE-4 (induced by source paper "alternating private alternating and quantum alternating realtime automata"):
  with members:
    - "the minimum amount of useful space new results and new directions"
    - "finite state verifiers with constant randomness"
    - "quantum finite automata a modern introduction"
    - "new results on the minimum amount of useful space"
    - "unbounded error quantum computation with small space bounds"
    - "languages recognized by nondeterministic quantum finite automata"

Connected through hyperedge HE-5 (induced by source paper "unary languages recognized by two way one counter automata"):
  with members:
    - "the minimum amount of useful space new results and new directions"
    - "new results on the minimum amount of useful space"
    - "reachability in two clock timed automata is pspace complete"
    - "equivalence of deterministic one counter automata is nl complete"
    - "log space counter is useful for unary languages by help of a constant size quantum register"
    - "one counter verifiers for decidable languages"
    - "succinctness of two way probabilistic and quantum finite automata"
    - "two way finite automata with quantum and classical states"

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)