human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "scattered factor universality of words"):
  Abstract: A word $u=u_1\dots u_n$ is a scattered factor of a word $w$ if $u$ can be obtained from $w$ by deleting some of its letters: there exist the (potentially empty) words $v_0,v_1,..,v_n$ such that $w = v_0u_1v_1...u_nv_n$. The set of all scattered factors up to length $k$ of a word is called its full $k$-spectrum. Firstly, we show an algorithm deciding whether the $k$-spectra for given $k$ of two words are equal or not, running in optimal time. Secondly, we consider a notion of scattered-factors universality: the word $w$, with $\letters(w)=\Sigma$, is called $k$-universal if its $k$-spectrum includes all words of length $k$ over the alphabet $\Sigma$; we extend this notion to $k$-circular universality. After a series of preliminary combinatorial results, we present an algorithm computing, for a given $k'$-universal word $w$ the minimal $i$ such that $w^i$ is $k$-universal for some $k>k'$. Several other connected problems~are~also~considered.

Includes members:
  Member "k spectra of weakly c balanced words":
    also connected through other hyperedges:
      (none)
  Member "languages ordered by the subword order":
    also connected through other hyperedges:
      (none)
  Member "computing the k binomial complexity of the thue morse word":
    also connected through other hyperedges:
      (none)
  Member "testing simon s congruence":
    also connected through other hyperedges:
      (none)
  Member "multivariate fine grained complexity of longest common subsequence":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "streaming with oracle new streaming algorithms for edit distance and lcs")
  Member "decidability complexity and expressiveness of first order logic over the subword ordering":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "the theory of concatenation over finite models")
  Member "complexity of universality and related problems for partially ordered nfas":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "partially ordered automata and piecewise testability")
  Member "the complexity of downward closure comparisons":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "reachability in vector addition systems is primitive recursive in fixed dimension")

Question: Please tell me which class the source paper 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)