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: "k rust an executable formal semantics for rust"
  Abstract: Rust is a system programming language designed for providing better memory safety whilst maintaining performance. Formalizing Rust is a necessary way to prove its memory safety and construct formal analysis tools for Rust. In this paper, we introduce an executable formal semantics of Rust using K-Framework (K), called K-Rust. K-Rust includes two parts: (1) the formal model of the ownership system, which is one of Rust's most compelling features for realizing its memory safety and zero-coast abstraction; (2) the formal operational semantics of Rust based on a core-language. The formal models are tested against various programs and compared with Rust's compiler to ensure the semantics consistency between K-Rust and the compiler. Through the construction of K-Rust we detected inconsistencies of the ownership mechanism between the Rust compiler and the specification in The Rust Programming Language.

Connected through hyperedge HE-1 (induced by source paper "oxide the essence of rust"):
  with members:
    - "rust distilled an expressive tower of languages"
    - "krust a formal executable semantics of rust"
    - "programming with permissions in mezzo"

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.PL(Programming Languages)