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 fo 2 quantifier alternation over words"
  Abstract: We show that each level of the quantifier alternation hierarchy within FO 2[ < ] on words is a variety of languages. We use the notion of condensed rankers, a refinement of the rankers defined by Weis and Immerman, to produce a decidable hierarchy of varieties which is interwoven with the quantifier alternation hierarchy --- and conjecturally equal to it. It follows that the latter hierarchy is decidable within one unit, a much more precise result than what is known about the quantifier alternation hierarchy within FO[ < ], where no decidability result is known beyond the very first levels.

Connected through hyperedge HE-1 (induced by source paper "the fo2 alternation hierarchy is decidable"):
  with members:
    - "lattices of logical fragments over words"
    - "the join levels of the trotter weil hierarchy are decidable"
    - "languages of dot depth one over infinite words"
    - "an introduction to finite automata and their connection to logic"
    - "structure theorem and strict alternation hierarchy for fo2 on words"
    - "logic meets algebra the case of regular languages"

Connected through hyperedge HE-2 (induced by source paper "an effective characterization of the alternation hierarchy in two variable logic"):
  with members:
    - "quantifier alternation in two variable first order logic with successor is decidable"
    - "the fo2 alternation hierarchy is decidable"
    - "structure theorem and strict alternation hierarchy for fo2 on 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.LO(Logic in Computer Science)