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: "safety alternating automata on data words"
  Abstract: A data word is a sequence of pairs of a letter from a finite alphabet and an element from an infinite set, where the latter can only be compared for equality. Safety one-way alternating automata with one register on infinite data words are considered, their nonemptiness is shown EXPSPACE-complete, and their inclusion decidable but not primitive recursive. The same complexity bounds are obtained for satisfiability and refinement, respectively, for the safety fragment of linear temporal logic with freeze quantification. Dropping the safety restriction, adding past temporal operators, or adding one more register, each causes undecidability.

Connected through hyperedge HE-1 (induced by source paper "relating timed and register automata"):
  with members:
    - "weak alternating timed automata"
    - "ackermannian and primitive recursive bounds with dickson s lemma"
    - "on termination for faulty channel machines"
    - "ltl with the freeze quantifier and register automata"
    - "alternating timed automata"

Connected through hyperedge HE-2 (induced by source paper "a decidable class of nominal omega regular languages over an infinite alphabet"):
  with members:
    - "an automaton over data words that captures emso logic"
    - "feasible automata for two variable logic with successor on data words"
    - "extending buchi automata with constraints on data values"
    - "ltl with the freeze quantifier and register automata"

Connected through hyperedge HE-3 (induced by source paper "automata for two variable logic over trees with ordered data values"):
  with members:
    - "two variable logic with two order relations"
    - "feasible automata for two variable logic with successor on data words"

Connected through hyperedge HE-4 (induced by source paper "graph reachability and pebble automata over infinite alphabets"):
  with members:
    - "on pebble automata for data languages with decidable emptiness problem"
    - "ltl with the freeze quantifier and register automata"
    - "on the freeze quantifier in constraint ltl decidability and complexity"

Connected through hyperedge HE-5 (induced by source paper "feasible automata for two variable logic with successor on data words"):
  with members:
    - "an automaton over data words that captures emso logic"
    - "a decidable extension of data automata"
    - "ltl with the freeze quantifier and register automata"

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)