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: "on combinatorial generation of prefix normal words"
  Abstract: A prefix normal word is a binary word with the property that no substring has more 1s than the prefix of the same length. This class of words is important in the context of binary jumbled pattern matching. In this paper we present an efficient algorithm for exhaustively listing the prefix normal words with a fixed length. The algorithm is based on the fact that the language of prefix normal words is a bubble language, a class of binary languages with the property that, for any word w in the language, exchanging the first occurrence of 01 by 10 in w results in another word in the language. We prove that each prefix normal word is produced in O(n) amortized time, and conjecture, based on experimental evidence, that the true amortized running time is O(polylog(n)).

Connected through hyperedge HE-1 (induced by source paper "generating a gray code for prefix normal words in amortized polylogarithmic time per word"):
  with members:
    - "on collapsing prefix normal words"
    - "bubble flip a new generation algorithm for prefix normal words"
    - "on prefix normal words and prefix normal forms"
    - "clustered integer 3sum via additive combinatorics"
    - "normal abby normal prefix normal"
    - "on hardness of jumbled indexing"
    - "new algorithms for binary jumbled pattern matching"
    - "binary jumbled pattern matching on trees and tree like structures"

Connected through hyperedge HE-2 (induced by source paper "on collapsing prefix normal words"):
  with members:
    - "bubble flip a new generation algorithm for prefix normal words"
    - "on prefix normal words and prefix normal forms"
    - "clustered integer 3sum via additive combinatorics"
    - "normal abby normal prefix normal"
    - "algorithms for jumbled pattern matching in strings"
    - "on prefix normal words"

Connected through hyperedge HE-3 (induced by source paper "on prefix normal words and prefix normal forms"):
  with members:
    - "clustered integer 3sum via additive combinatorics"
    - "normal abby normal prefix normal"
    - "binary jumbled pattern matching via all pairs shortest paths"
    - "new algorithms for binary jumbled pattern matching"
    - "indexes for jumbled pattern matching in strings trees and graphs"
    - "binary jumbled string matching for highly run length compressible texts"
    - "binary jumbled pattern matching on trees and tree like structures"
    - "algorithms for jumbled pattern matching in strings"

Connected through hyperedge HE-4 (induced by source paper "bubble flip a new generation algorithm for prefix normal words"):
  with members:
    - "on prefix normal words and prefix normal forms"
    - "clustered integer 3sum via additive combinatorics"
    - "normal abby normal prefix normal"
    - "on hardness of jumbled indexing"
    - "new algorithms for binary jumbled pattern matching"
    - "binary jumbled pattern matching on trees and tree like structures"
    - "algorithms for jumbled pattern matching in strings"
    - "on prefix normal words"

Connected through hyperedge HE-5 (induced by source paper "normal abby normal prefix normal"):
  with members:
    - "binary jumbled pattern matching via all pairs shortest paths"
    - "new algorithms for binary jumbled pattern matching"
    - "indexes for jumbled pattern matching in strings trees and graphs"
    - "binary jumbled string matching for highly run length compressible texts"
    - "binary jumbled pattern matching on trees and tree like structures"
    - "on prefix normal words"

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.DS(Data Structures and Algorithms)