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: "blockchain oriented software engineering challenges and new directions"
  Abstract: The Blockchain technology is reshaping finance, economy, money to the extent that its disruptive power is compared to that of the Internet and the Web in their early days. As a result, all the software development revolving around the Blockchain technology is growing at a staggering rate. In this paper, we acknowledge the need for software engineers to devise specialized tools and techniques for blockchain-oriented software development. From current challenges concerning the definition of new professional roles, demanding testing activities and novel tools for software architecture, we take a step forward by proposing new directions on the basis of a curate corpus of blockchain-oriented software repositories, detected by exploiting the information enclosed in the 2016 Moody's Blockchain Report and teh market capitalization of cryptocurrencies. Ensuring effective testing activities, enhancing collaboration in large teams, and facilitating the development of smart contracts all appear as key factors in the future of blockchain-oriented software development.

Connected through hyperedge HE-1 (induced by source paper "a first look at blockchain based decentralized applications"):
  with members:
    - "a blockchain enabled trustless crowd intelligence ecosystem on mobile edge computing"
    - "proofware proof of useful work blockchain consensus protocol for decentralized applications"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "scompile critical path identification and analysis for smart contracts"
    - "an adaptive gas cost mechanism for ethereum to defend against under priced dos attacks"
    - "under optimized smart contracts devour your money"

Connected through hyperedge HE-2 (induced by source paper "design and evaluation of smart contract based system operations for permissioned blockchain based systems"):
  with members:
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "applying software patterns to address interoperability in blockchain based healthcare apps"
    - "a byzantine fault tolerant ordering service for the hyperledger fabric blockchain platform"
    - "non determinism in byzantine fault tolerant replication"

Connected through hyperedge HE-3 (induced by source paper "an empirical study into the success of listed smart contracts in ethereum"):
  with members:
    - "characterizing code clones in the ethereum smart contract ecosystem"
    - "smart contracts software metrics a first study"
    - "an empirical analysis of smart contracts platforms applications and design patterns"

Connected through hyperedge HE-4 (induced by source paper "an empirical study of blockchain based decentralized applications"):
  with members:
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "scompile critical path identification and analysis for smart contracts"
    - "understanding diverse usage patterns from large scale appstore service profiles"

Connected through hyperedge HE-5 (induced by source paper "abcde agile block chain dapp engineering"):
  with members:
    - "security analysis methods on ethereum smart contract vulnerabilities a survey"
    - "an agile software engineering method to design blockchain applications"
    - "the ico phenomenon and its relationships with ethereum smart contract environment"

Connected through hyperedge HE-6 (induced by source paper "on using blockchains for safety critical systems"):
  with members:
    - "blockchain based smart contracts a systematic mapping study"
    - "design criteria to architect continuous experimentation for self driving vehicles"
    - "an analysis of iso 26262 using machine learning safely in automotive software"
    - "keeping continuous deliveries safe"
    - "the sharing economy for the smart grid"
    - "blockchain in internet of things challenges and solutions"
    - "caroline an autonomously driving vehicle for urban environments"

Connected through hyperedge HE-7 (induced by source paper "smart contracts software metrics a first study"):
  with members:
    - "an empirical analysis of smart contracts platforms applications and design patterns"
    - "software graphs and programmer awareness"
    - "power law distributions in class relationships"

Connected through hyperedge HE-8 (induced by source paper "smart contracts for machine to machine communication possibilities and limitations"):
  with members:
    - "blendcac a blockchain enabled decentralized capability based access control for iots"
    - "smart contract based access control for the internet of things"

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)