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: "towards multistage design of modular systems"
  Abstract: The paper describes multistage design of composite (modular) systems (i.e., design of a system trajectory). This design process consists of the following: (i) definition of a set of time/logical points; (ii) modular design of the system for each time/logical point (e.g., on the basis of combinatorial synthesis as hierarchical morphological design or multiple choice problem) to obtain several system solutions; (iii) selection of the system solution for each time/logical point while taking into account their quality and the quality of compatibility between neighbor selected system solutions (here, combinatorial synthesis is used as well). Mainly, the examined time/logical points are based on a time chain. In addition, two complicated cases are considered: (a) the examined logical points are based on a tree-like structure, (b) the examined logical points are based on a digraph. Numerical examples illustrate the approach.

Connected through hyperedge HE-1 (induced by source paper "towards integrated glance to restructuring in combinatorial optimization"):
  with members:
    - "discrete route trajectory decision making problems"
    - "towards combinatorial clustering preliminary research survey"

Connected through hyperedge HE-2 (induced by source paper "towards decision support technology platform for modular systems"):
  with members:
    - "multiset estimates and combinatorial synthesis"
    - "note on evaluation of hierarchical modular systems"
    - "towards detection of bottlenecks in modular systems"
    - "improvement extension of modular systems as combinatorial reengineering survey"
    - "morphological methods for design of modular systems a survey"
    - "towards electronic shopping of composite product"
    - "aggregation of composite solutions strategies models examples"
    - "towards configuration of applied web based information system"

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.AI(Artificial Intelligence)