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: "sif a framework for solidity code instrumentation and analysis"
  Abstract: Solidity is an object-oriented and high-level language for writing smart contracts which are used to execute, verify and enforce credible transactions on permissionless blockchains. In the last few years, analysis of vulnerabilities in smart contracts has raised considerable interest and numerous techniques have been proposed. Current techniques lack traceability in source code and have widely differing work flows. There is no single unifying framework for analysis, instrumentation, optimisation and code generation of Solidity contracts. #R##N#In this paper, we present SIF, a comprehensive framework for Solidity contract monitoring, instrumenting, and code generation. SIF provides support for Solidity contract developers and testers to build source level techniques for analysis, bug detection, coverage measurement, optimisations and code generation. We show feasibility and applicability of the framework using 51 real smart contracts deployed on the Ethereum network.

Connected through hyperedge HE-1 (induced by source paper "mutation testing of smart contracts at scale"):
  with members:
    - "truffle tests for free replaying ethereum smart contracts for transparency"
    - "basis path coverage criteria for smart contract application testing"
    - "testing smart contracts gets smarter"
    - "oracle supported dynamic exploit generation for smart contracts"
    - "evmfuzz differential fuzz testing of ethereum virtual machine"
    - "mutation testing for ethereum smart contract"
    - "user experience with language independent formal verification"

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.SE(Software Engineering)