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 primary and secondary repetitions in words"
  Abstract: Combinatorial properties of maximal repetitions (runs) in formal words are studied. We classify all maximal repetitions in a word as primary and secondary where the set of all primary repetitions determines all the other repetitons in the word. Essential combinatorial properties of primary repetitions are established.

Connected through hyperedge HE-1 (induced by source paper "on the number of gapped repeats with arbitrary gap"):
  with members:
    - "the runs theorem"
    - "efficiently finding all maximal alpha gapped repeats"
    - "longest gapped repeats and palindromes"
    - "searching of gapped repeats and subrepetitions in a word"
    - "on the maximal sum of exponents of runs in a string"

Connected through hyperedge HE-2 (induced by source paper "optimal searching of gapped repeats in a word"):
  with members:
    - "the runs theorem"
    - "longest gapped repeats and palindromes"
    - "beyond the runs theorem"
    - "lempel ziv factorization may be harder than computing all runs"
    - "searching of gapped repeats and subrepetitions in a word"
    - "on the maximal sum of exponents of runs in a string"
    - "on maximal repetitions of arbitrary exponent"

Connected through hyperedge HE-3 (induced by source paper "lempel ziv factorization may be harder than computing all runs"):
  with members:
    - "searching of gapped repeats and subrepetitions in a word"
    - "faster compact on line lempel ziv factorization"
    - "lempel ziv parsing in external memory"
    - "on the maximal sum of exponents of runs in a string"

Connected through hyperedge HE-4 (induced by source paper "searching of gapped repeats and subrepetitions in a word"):
  with members:
    - "efficiently finding all maximal alpha gapped repeats"
    - "beyond the runs theorem"
    - "on the maximal sum of exponents of runs in a string"
    - "on maximal repetitions of arbitrary exponent"

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)