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: "periodicity repetitions and orbits of an automatic sequence"
  Abstract: We revisit a technique of S. Lehr on automata and use it to prove old and new results in a simple way. We give a very simple proof of the 1986 theorem of Honkala that it is decidable whether a given k-automatic sequence is ultimately periodic. We prove that it is decidable whether a given k-automatic sequence is overlap-free (or squareefree, or cubefree, etc.) We prove that the lexicographically least sequence in the orbit closure of a k-automatic sequence is k-automatic, and use this last result to show that several related quantities, such as the critical exponent, irrationality measure, and recurrence quotient for Sturmian words with slope alpha, have automatic continued fraction expansions if alpha does.

Connected through hyperedge HE-1 (induced by source paper "minimal automaton for multiplying and translating the thue morse set"):
  with members:
    - "state complexity of the multiples of the thue morse set"
    - "ultimate periodicity of b recognisable sets a quasilinear procedure"
    - "enumeration and decidable properties of automatic sequences"
    - "the growth function of s recognizable sets"
    - "minimal dfa for testing divisibility"

Connected through hyperedge HE-2 (induced by source paper "state complexity of the multiples of the thue morse set"):
  with members:
    - "ultimate periodicity of b recognisable sets a quasilinear procedure"
    - "enumeration and decidable properties of automatic sequences"
    - "the growth function of s recognizable sets"
    - "minimal dfa for testing divisibility"

Connected through hyperedge HE-3 (induced by source paper "abelian square rich words"):
  with members:
    - "maximum number of distinct and nonequivalent nonstandard squares in a word"
    - "words with the maximum number of abelian squares"
    - "cyclic complexity of words"
    - "decision algorithms for fibonacci automatic words with applications to pattern avoidance"
    - "on the number of unbordered factors"
    - "abelian repetitions in sturmian words"
    - "enumeration and decidable properties of automatic sequences"

Connected through hyperedge HE-4 (induced by source paper "sums of palindromes an approach via automata"):
  with members:
    - "on the number of unbordered factors"
    - "primitive words and lyndon words in automatic and linearly recurrent sequences"
    - "enumeration and decidable properties of automatic sequences"

Connected through hyperedge HE-5 (induced by source paper "an efficient algorithm to decide periodicity of b recognisable sets using lsdf convention"):
  with members:
    - "ultimate periodicity of b recognisable sets a quasilinear procedure"
    - "enumeration and decidable properties of automatic sequences"

Connected through hyperedge HE-6 (induced by source paper "mechanical proofs of properties of the tribonacci word"):
  with members:
    - "decision algorithms for fibonacci automatic words with applications to pattern avoidance"
    - "on the number of unbordered factors"
    - "primitive words and lyndon words in automatic and linearly recurrent sequences"
    - "subword complexity and k synchronization"
    - "enumeration and decidable properties of automatic sequences"

Connected through hyperedge HE-7 (induced by source paper "decision algorithms for fibonacci automatic words with applications to pattern avoidance"):
  with members:
    - "on the number of unbordered factors"
    - "primitive words and lyndon words in automatic and linearly recurrent sequences"
    - "enumeration and decidable properties of automatic sequences"
    - "pattern avoidability with involution"
    - "avoiding three consecutive blocks of the same size and same sum"

Connected through hyperedge HE-8 (induced by source paper "ultimate periodicity of b recognisable sets a quasilinear procedure"):
  with members:
    - "least significant digit first presburger automata"
    - "numeration systems on a regular language"

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.DM(Discrete Mathematics)