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: "from clarity to efficiency for distributed algorithms"
  Abstract: This article describes a very high-level language for clear description of distributed algorithms and optimizations necessary for generating efficient implementations. The language supports high-level control flows where complex synchronization conditions can be expressed using high-level queries, especially logic quantifications, over message history sequences. Unfortunately, the programs would be extremely inefficient, including consuming unbounded memory, if executed straightforwardly. #R##N#We present new optimizations that automatically transform complex synchronization conditions into incremental updates of necessary auxiliary values as messages are sent and received. The core of the optimizations is the first general method for efficient implementation of logic quantifications. We have developed an operational semantics of the language, implemented a prototype of the compiler and the optimizations, and successfully used the language and implementation on a variety of important distributed algorithms.

Connected through hyperedge HE-1 (induced by source paper "what s live understanding distributed consensus"):
  with members:
    - "moderately complex paxos made simple high level executable specification of distributed algorithms"
    - "paxos consensus deconstructed and abstracted extended version"
    - "paxos made epr decidable reasoning about distributed protocols"
    - "vive la difference paxos vs viewstamped replication vs zab"

Connected through hyperedge HE-2 (induced by source paper "moderately complex paxos made simple high level executable specification of distributed algorithms"):
  with members:
    - "simpler specifications and easier proofs of distributed algorithms using history variables"
    - "paxos made epr decidable reasoning about distributed protocols"
    - "formal verification of multi paxos for distributed consensus"
    - "vive la difference paxos vs viewstamped replication vs zab"

Connected through hyperedge HE-3 (induced by source paper "verification of threshold based distributed algorithms by decomposition to decidable logics"):
  with members:
    - "paxos made epr decidable reasoning about distributed protocols"
    - "a short counterexample property for safety and liveness verification of fault tolerant distributed algorithms"
    - "revisiting fast practical byzantine fault tolerance"

Connected through hyperedge HE-4 (induced by source paper "algorithm diversity for resilient systems"):
  with members:
    - "demand driven incremental object queries"

Connected through hyperedge HE-5 (induced by source paper "simpler specifications and easier proofs of distributed algorithms using history variables"):
  with members:
    - "paxos made epr decidable reasoning about distributed protocols"
    - "auxiliary variables in tla"
    - "formal verification of multi paxos for distributed consensus"
    - "demand driven incremental object queries"
    - "a tla proof system"

Connected through hyperedge HE-6 (induced by source paper "demand driven incremental object queries"):
  with members:
    - "incremental view maintenance for nested relational databases"
    - "incremental view maintenance for collection programming"

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)