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: "star free languages are church rosser congruential"
  Abstract: The class of Church-Rosser congruential languages has been introduced by McNaughton, Narendran, and Otto in 1988. A language L is Church-Rosser congruential (belongs to CRCL), if there is a finite, confluent, and length-reducing semi-Thue system S such that L is a finite union of congruence classes modulo S. To date, it is still open whether every regular language is in CRCL. In this paper, we show that every star-free language is in CRCL. In fact, we prove a stronger statement: for every star-free language L there exists a finite, confluent, and subword-reducing semi-Thue system S such that the total number of congruence classes modulo S is finite and such that L is a union of congruence classes modulo S. The construction turns out to be effective.

Connected through hyperedge HE-1 (induced by source paper "church rosser systems codes with bounded synchronization delay and local rees extensions"):
  with members:
    - "characterizing classes of regular languages using prefix codes of bounded synchronization delay"
    - "a survey on the local divisor technique"
    - "star free languages and local divisors"
    - "regular languages are church rosser congruential"

Connected through hyperedge HE-2 (induced by source paper "parikh reducing church rosser representations for some classes of regular languages"):
  with members:
    - "characterizing classes of regular languages using prefix codes of bounded synchronization delay"
    - "a survey on the local divisor technique"
    - "regular languages are church rosser congruential"

Connected through hyperedge HE-3 (induced by source paper "characterizing classes of regular languages using prefix codes of bounded synchronization delay"):
  with members:
    - "a survey on the local divisor technique"

Connected through hyperedge HE-4 (induced by source paper "a survey on the local divisor technique"):
  with members:
    - "refinement and difference for probabilistic automata"
    - "linear temporal logic for regular cost functions"
    - "regular languages are church rosser congruential"

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)