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: "autonomous push down automaton built on dna"
  Abstract: In this paper we propose a biomolecular implementation of the push-down automaton (one of theoretical models of computing device with unbounded memory) using DNA molecules. The idea of this improved implementation was inspired by Cavaliere et al. (2005).

Connected through hyperedge HE-1 (induced by source paper "infinite object coating in the amoebot model"):
  with members:
    - "active self assembly of algorithmic shapes and patterns in polylogarithmic time"
    - "ameba inspired self organizing particle systems"
    - "a distributed algorithm for gathering many fat mobile robots in the plane"
    - "physarum can compute shortest paths"
    - "evacuation of rectilinear polygons"
    - "self assembly of arbitrary shapes using rnase enzymes meeting the kolmogorov bound with small scale factor extended abstract"
    - "distributed agreement in tile self assembly"
    - "polygon exploration with time discrete vision"

Connected through hyperedge HE-2 (induced by source paper "ameba inspired self organizing particle systems"):
  with members:
    - "physarum can compute shortest paths"
    - "self assembly of arbitrary shapes using rnase enzymes meeting the kolmogorov bound with small scale factor extended abstract"

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)