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: "on ternary square free circular words"
  Abstract: Circular words are cyclically ordered finite sequences of letters. We give a computer-free proof of the following result by Currie: square-free circular words over the ternary alphabet exist for all lengths $l$ except for 5, 7, 9, 10, 14, and 17. Our proof reveals an interesting connection between ternary square-free circular words and closed walks in the $K_{3{,}3}$ graph. In addition, our proof implies an exponential lower bound on the number of such circular words of length $l$ and allows one to list all lengths $l$ for which such a circular word is unique up to isomorphism.

Connected through hyperedge HE-1 (induced by source paper "circularly squarefree words and unbordered conjugates a new approach"):
  with members:
    - "circular critical exponents for thue morse factors"
    - "automatic theorem proving in walnut"

Connected through hyperedge HE-2 (induced by source paper "subword complexity and power avoidance"):
  with members:
    - "fife s theorem for 7 3 powers"
    - "fife s theorem revisited"
    - "on the number of dejean words over alphabets of 5 6 7 8 9 and 10 letters"

Connected through hyperedge HE-3 (induced by source paper "distinct squares in circular words"):
  with members:
    - "linear time sequence comparison using minimal absent words applications"
    - "representations of circular words"

Connected through hyperedge HE-4 (induced by source paper "representations of circular words"):
  with members:
    - "circular words and applications"

Connected through hyperedge HE-5 (induced by source paper "combinatorial characterization of formal languages"):
  with members:
    - "almost overlap free words and the word problem for the free burnside semigroup satisfying x 2 x 3"
    - "quotient complexity of closed languages"
    - "quotient complexity of regular languages"

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)