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: "satisfiability of acyclic and almost acyclic cnf formulas"
  Abstract: We show that the Satisfiability (SAT) problem for CNF formulas with @b-acyclic hypergraphs can be solved in polynomial time by using a special type of Davis-Putnam resolution in which each resolvent is a subset of a parent clause. We extend this class to CNF formulas for which this type of Davis-Putnam resolution still applies and show that testing membership in this class is NP-complete. We compare the class of @b-acyclic formulas and this superclass with a number of known polynomial formula classes. We then study the parameterized complexity of SAT for ''almost'' @b-acyclic instances, using as parameter the formula's distance from being @b-acyclic. As distance we use the size of a smallest strong backdoor set and the @b-hypertree width. As a by-product we obtain the W[1]-hardness of SAT parameterized by the (undirected) clique-width of the incidence graph, which disproves a conjecture by Fischer, Makowsky, and Ravve.

Connected through hyperedge HE-1 (induced by source paper "complexity and approximability of parameterized max csps"):
  with members:
    - "solving maxsat and sat on structured cnf formulas"
    - "tractable answer set programming with weight constraints bounded treewidth is not enough"
    - "guarantees and limits of preprocessing in constraint satisfaction and reasoning"
    - "model counting for formulas of bounded clique width"
    - "a characterization of approximation resistance for even k partite csps"
    - "majority is stablest discrete and sos"
    - "backdoors to acyclic sat"
    - "not so easy problems for tree decomposable graphs"

Connected through hyperedge HE-2 (induced by source paper "understanding the complexity of sat using knowledge compilation"):
  with members:
    - "new limits for knowledge compilation and applications to exact model counting"
    - "hypergraph acyclicity and propositional model counting"
    - "solving maxsat and sat on structured cnf formulas"
    - "understanding model counting for beta acyclic cnf formulas"
    - "no small nondeterministic read once branching programs for cnfs of bounded treewidth"
    - "model counting for formulas of bounded clique width"
    - "on obdds for cnfs of bounded treewidth"
    - "lower bounds for exact model counting and applications in probabilistic databases"

Connected through hyperedge HE-3 (induced by source paper "strong backdoors for linear temporal logic"):
  with members:
    - "ltl fragments are hard for standard parameterisations"
    - "backdoors to normality for disjunctive logic programs"
    - "the complexity of clausal fragments of ltl"
    - "backdoors to satisfaction"
    - "backdoors to tractable answer set programming"
    - "the complexity of generalized satisfiability for linear temporal logic"
    - "clausal temporal resolution"

Connected through hyperedge HE-4 (induced by source paper "parameterized compilation lower bounds for restricted cnf formulas"):
  with members:
    - "complexity and approximability of parameterized max csps"
    - "understanding model counting for beta acyclic cnf formulas"
    - "no small nondeterministic read once branching programs for cnfs of bounded treewidth"
    - "between treewidth and clique width"
    - "on obdds for cnfs of bounded treewidth"
    - "a knowledge compilation map"

Connected through hyperedge HE-5 (induced by source paper "strong backdoors for default logic"):
  with members:
    - "backdoors to normality for disjunctive logic programs"
    - "backdoors to abduction"
    - "backdoors to satisfaction"
    - "backdoors to tractable answer set programming"
    - "the complexity of propositional implication"

Connected through hyperedge HE-6 (induced by source paper "model counting for formulas of bounded clique width"):
  with members:
    - "strong backdoors to bounded treewidth sat"
    - "better algorithms for satisfiability problems for formulas of bounded rank width"

Connected through hyperedge HE-7 (induced by source paper "hypergraph acyclicity and propositional model counting"):
  with members:
    - "model counting for formulas of bounded clique width"

Connected through hyperedge HE-8 (induced by source paper "paradigms for parameterized enumeration"):
  with members:
    - "a polynomial kernel for proper interval vertex deletion"

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.DS(Data Structures and Algorithms)