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 "on collapsing prefix normal words"):
  Abstract: Prefix normal words are binary words in which each prefix has at least the same number of $\so$s as any factor of the same length. Firstly introduced by Fici and Liptak in 2011, the problem of determining the index of the prefix equivalence relation is still open. In this paper, we investigate two aspects of the problem, namely prefix normal palindromes and so-called collapsing words (extending the notion of critical words). We prove characterizations for both the palindromes and the collapsing words and show their connection. Based on this, we show that still open problems regarding prefix normal words can be split into certain subproblems.

Includes members:
  Member "bubble flip a new generation algorithm for prefix normal words":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "generating a gray code for prefix normal words in amortized polylogarithmic time per word")
  Member "on prefix normal words and prefix normal forms":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "generating a gray code for prefix normal words in amortized polylogarithmic time per word")
  Member "clustered integer 3sum via additive combinatorics":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "all non trivial variants of 3 ldt are equivalent")
  Member "on combinatorial generation of prefix normal words":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "generating a gray code for prefix normal words in amortized polylogarithmic time per word")
  Member "normal abby normal prefix normal":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "generating a gray code for prefix normal words in amortized polylogarithmic time per word")
  Member "algorithms for jumbled pattern matching in strings":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "generating a gray code for prefix normal words in amortized polylogarithmic time per word")
  Member "on prefix normal words":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "generating a gray code for prefix normal words in amortized polylogarithmic time per word")

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)