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: "avoiding three consecutive blocks of the same size and same sum"
  Abstract: We show that there exists an infinite word over the alphabet {0, 1, 3, 4} containing no three consecutive blocks of the same size and the same sum. This answers an open problem of Pirillo and Varricchio from 1994.

Connected through hyperedge HE-1 (induced by source paper "ten conferences words open problems and conjectures"):
  with members:
    - "maximum number of distinct and nonequivalent nonstandard squares in a word"
    - "balance properties of arnoux rauzy words"

Connected through hyperedge HE-2 (induced by source paper "relations on words"):
  with members:
    - "on the index of simon s congruence for piecewise testability"
    - "testing k binomial equivalence"
    - "a new approach to the 2 regularity of the ell abelian complexity of 2 automatic sequences"
    - "avoiding 2 binomial squares and cubes"
    - "fixed points avoiding abelian k powers"
    - "on the complexity of the equivalence problem for probabilistic automata"

Connected through hyperedge HE-3 (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"
    - "periodicity repetitions and orbits of an automatic sequence"

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)