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 "the grammar hammer of 2012"):
  Abstract: This document is a case study in aggressive self-archiving. It collects all initiatives undertaken by its author in 2012, including unpublished ones, explains their relevance and relation with one another. Discussed topics include guided convergence of formal grammars in a broad sense, programmable grammar transformation operator suites, metasyntactic specifications and methods of their manipulation, tolerant (soft computing) methods in parsing theory, megamodelling as modelling linguistic architecture of software systems, repositories of grammatical knowledge, open notebook computer science, as well as the number of minor topics (new parsing algorithms, visualisation techniques, etc). A brief overview of involved venues is also included in the report.

Includes members:
  Member "guided grammar convergence":
    also connected through other hyperedges:
      (none)
  Member "choosing products in social networks":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "paradoxes in social networks with multiple products")
  Member "guided grammar convergence full case study report generated by converge guided":
    also connected through other hyperedges:
      (none)
  Member "mediawiki grammar recovery":
    also connected through other hyperedges:
      (none)
  Member "well typed islands parse faster":
    also connected through other hyperedges:
      (none)

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)