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: "on tractability and congruence distributivity"
  Abstract: Constraint languages that arise from finite algebras have recently been the#N#object of study, especially in connection with the Dichotomy Conjecture of#N#Feder and Vardi. An important class of algebras are those that generate#N#congruence distributive varieties and included among this class are lattices,#N#and more generally, those algebras that have near-unanimity term operations. An#N#algebra will generate a congruence distributive variety if and only if it has a#N#sequence of ternary term operations, called Jonsson terms, that satisfy certain#N#equations.#N#  We prove that constraint languages consisting of relations that are invariant#N#under a short sequence of Jonsson terms are tractable by showing that such#N#languages have bounded relational width.

Connected through hyperedge HE-1 (induced by source paper "logic column 17 a rendezvous of logic complexity and algebra"):
  with members:
    - "a characterisation of first order constraint satisfaction problems"
    - "generalized majority minority operations are tractable"
    - "linear datalog and bounded path duality of relational structures"

Connected through hyperedge HE-2 (induced by source paper "the complexity of quantified constraint satisfaction collapsibility sink algebras and the three element case"):
  with members:
    - "generalized majority minority operations are tractable"

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.CC(Computational Complexity)