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: "the minimum amount of useful space new results and new directions"
  Abstract: We consider minimal space requirements when using memory with restricted access policy (pushdown - hence giving pushdown automata (PDAs), and counter - hence giving counter automata (CAs)) in connection with two-way and realtime head motion. The main results are that: (i) $ \log \log n $ is a tight space lower bound for accepting general nonregular languages on weak realtime PDAs, (ii) there exist unary nonregular languages accepted by realtime alternating CAs within weak $ \log n $ space, (iii) there exist nonregular languages accepted by two-way DPADs within strong $ \log \log n $ space, and, (iv) there exist unary nonregular languages accepted by two-way CAs with quantum and classical states within middle $ \log n $ space and bounded error.

Connected through hyperedge HE-1 (induced by source paper "classical automata on promise problems"):
  with members:
    - "unary probabilistic and quantum automata on promise problems"
    - "recognizability versus solvability of promise problems in finite classical and quantum automata framework"
    - "potential of quantum finite automata with exact acceptance"
    - "on the state complexity of semi quantum finite automata"
    - "new results on the minimum amount of useful space"
    - "superiority of exact quantum automata for promise problems"
    - "succinctness of two way probabilistic and quantum finite automata"
    - "two way finite automata with quantum and classical states"

Connected through hyperedge HE-2 (induced by source paper "alternating private alternating and quantum alternating realtime automata"):
  with members:
    - "finite state verifiers with constant randomness"
    - "classical and quantum realtime alternating automata"
    - "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-3 (induced by source paper "new results on the minimum amount of useful space"):
  with members:
    - "quantum finite automata a modern introduction"
    - "one counter verifiers for decidable languages"
    - "tight bounds for the space complexity of nonregular language recognition by real time machines"
    - "two way finite automata with quantum and classical states"

Connected through hyperedge HE-4 (induced by source paper "classical and quantum realtime alternating automata"):
  with members:
    - "automata and quantum computing"
    - "new results on the minimum amount of useful space"
    - "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:
    - "classical and quantum realtime alternating automata"
    - "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)