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: "recompression a simple and powerful technique for word equations"
  Abstract: In this paper we present an application of a simple technique of local recompression, previously developed by the author in the context of compressed membership problems and compressed pattern matching, to word equations. The technique is based on local modification of variables (replacing X by aX or Xa) and iterative replacement of pairs of letters appearing in the equation by a `fresh' letter, which can be seen as a bottom-up compression of the solution of the given word equation, to be more specific, building an SLP (Straight-Line Programme) for the solution of the word equation. #R##N#Using this technique we give a new, independent and self-contained proofs of most of the known results for word equations. To be more specific, the presented (nondeterministic) algorithm runs in O(n log n) space and in time polynomial in log N, where N is the size of the length-minimal solution of the word equation. The presented algorithm can be easily generalised to a generator of all solutions of the given word equation (without increasing the space usage). Furthermore, a further analysis of the algorithm yields a doubly exponential upper bound on the size of the length-minimal solution. The presented algorithm does not use exponential bound on the exponent of periodicity. Conversely, the analysis of the algorithm yields an independent proof of the exponential bound on exponent of periodicity. #R##N#We believe that the presented algorithm, its idea and analysis are far simpler than all previously applied. Furthermore, thanks to it we can obtain a unified and simple approach to most of known results for word equations. #R##N#As a small additional result we show that for O(1) variables (with arbitrary many appearances in the equation) word equations can be solved in linear space, i.e. they are context-sensitive.

Connected through hyperedge HE-1 (induced by source paper "a survey on string constraint solving"):
  with members:
    - "sound regular expression semantics for dynamic symbolic execution of javascript"
    - "what is decidable about string constraints with the replaceall function"
    - "undecidability of a theory of strings linear arithmetic over length and string number conversion"
    - "a solver for a theory of strings and bit vectors"
    - "minizinc with strings"
    - "regular combinators for string transformations"
    - "approximation of grammar based compression via recompression"
    - "algorithm selection for combinatorial search problems a survey"

Connected through hyperedge HE-2 (induced by source paper "matching patterns with variables"):
  with members:
    - "graph and string parameters connections between pathwidth cutwidth and the locality number"
    - "quadratic word equations with length constraints counter systems and presburger arithmetic with divisibility"
    - "the hardness of solving simple word equations"
    - "the runs theorem"
    - "decidability complexity and expressiveness of first order logic over the subword ordering"
    - "detecting one variable patterns"
    - "solutions of word equations over partially commutative structures"
    - "a parameterized study of maximum generalized pattern matching problems"

Connected through hyperedge HE-3 (induced by source paper "string synchronizing sets sublinear time bwt construction and optimal lce data structure"):
  with members:
    - "quasi linear time algorithm for longest common circular factor"
    - "locally consistent parsing for text indexing in small space"
    - "text indexing and searching in sublinear time"
    - "optimal construction of compressed indexes for highly repetitive texts"
    - "space efficient construction of compressed indexes in deterministic linear time"
    - "wavelet trees meet suffix trees"
    - "linear time construction of compressed text indices in compact space"
    - "internal pattern matching queries in a text and applications"

Connected through hyperedge HE-4 (induced by source paper "internal dictionary matching"):
  with members:
    - "computing all distinct squares in linear time for integer alphabets"
    - "unifying and strengthening hardness for dynamic problems via the online matrix vector multiplication conjecture"
    - "wavelet trees meet suffix trees"
    - "internal pattern matching queries in a text and applications"
    - "a linear time algorithm for seeds computation"
    - "faster fully compressed pattern matching by recompression"

Connected through hyperedge HE-5 (induced by source paper "on solving word equations using sat"):
  with members:
    - "the hardness of solving simple word equations"

Connected through hyperedge HE-6 (induced by source paper "quadratic word equations with length constraints counter systems and presburger arithmetic with divisibility"):
  with members:
    - "the satisfiability of extended word equations the boundary between decidability and undecidability"
    - "the hardness of solving simple word equations"
    - "algorithmic metatheorems for decidable ltl model checking over infinite systems"
    - "unary finite automata vs arithmetic progressions"

Connected through hyperedge HE-7 (induced by source paper "decision procedures for path feasibility of string manipulating programs with complex operations"):
  with members:
    - "what is decidable about string constraints with the replaceall function"
    - "graph logics with rational relations"
    - "the complexity of games on higher order pushdown automata"

Connected through hyperedge HE-8 (induced by source paper "the satisfiability of extended word equations the boundary between decidability and undecidability"):
  with members:
    - "decidability complexity and expressiveness of first order logic over the subword ordering"

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)