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: "backdoors to satisfaction"
  Abstract: A backdoor set is a set of variables of a propositional formula such that fixing the truth values of the variables in the backdoor set moves the formula into some polynomial-time decidable class. If we know a small backdoor set we can reduce the question of whether the given formula is satisfiable to the same question for one or several easy formulas that belong to the tractable class under consideration. In this survey we review parameterized complexity results for problems that arise in the context of backdoor sets, such as the problem of finding a backdoor set of size at most k, parameterized by k. We also discuss recent results on backdoor sets for problems that are beyond NP.

Connected through hyperedge HE-1 (induced by source paper "hunting for tractable languages for judgment aggregation"):
  with members:
    - "a partial taxonomy of judgment aggregation rules and their properties"
    - "algebraic model counting"
    - "a knowledge compilation map"

Connected through hyperedge HE-2 (induced by source paper "the complexity landscape of decompositional parameters for ilp"):
  with members:
    - "a structural approach to kernels for ilps treewidth and total unimodularity"
    - "structural parameterizations of the mixed chinese postman problem"
    - "better algorithms for satisfiability problems for formulas of bounded rank width"

Connected through hyperedge HE-3 (induced by source paper "backdoors into heterogeneous classes of sat and csp"):
  with members:
    - "combining treewidth and backdoors for csp"
    - "discovering archipelagos of tractability for constraint satisfaction and counting"
    - "solving problems on graphs of high rank width"
    - "meta kernelization using well structured modulators"
    - "on backdoors to tractable constraint languages"
    - "backdoors to abduction"
    - "strong backdoors to bounded treewidth sat"
    - "the tractability of csp classes defined by forbidden patterns"

Connected through hyperedge HE-4 (induced by source paper "solving integer linear programs with a small number of global variables and constraints"):
  with members:
    - "a parameterized strongly polynomial algorithm for block structured integer programs"
    - "scheduling meets n fold integer programming"
    - "the complexity landscape of decompositional parameters for ilp"
    - "backdoors into heterogeneous classes of sat and csp"
    - "voting and bribing in single exponential time"
    - "a structural approach to kernels for ilps treewidth and total unimodularity"
    - "on the computational complexity of vertex integrity and component order connectivity"

Connected through hyperedge HE-5 (induced by source paper "structural decompositions for problems with global constraints"):
  with members:
    - "size bounds and query plans for relational joins"
    - "constraint solving via fractional edge covers"
    - "tractable combinations of global constraints"
    - "tractable optimization problems through hypergraph based structural restrictions"
    - "decomposition of the nvalue constraint"
    - "the complexity of reasoning with global constraints"
    - "tractable hypergraph properties for constraint satisfaction and conjunctive queries"
    - "hypertree decompositions and tractable queries"

Connected through hyperedge HE-6 (induced by source paper "backdoors to tractable valued csp"):
  with members:
    - "the complexity landscape of decompositional parameters for ilp"
    - "differential game logic"
    - "necessary conditions for tractability of valued csps"
    - "discovering archipelagos of tractability for constraint satisfaction and counting"
    - "on backdoors to tractable constraint languages"
    - "the complexity of conservative valued csps"
    - "backdoors to normality for disjunctive logic programs"
    - "backdoors to tractable answer set programming"

Connected through hyperedge HE-7 (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"
    - "satisfiability of acyclic and almost acyclic cnf formulas"
    - "the complexity of clausal fragments of ltl"
    - "backdoors to tractable answer set programming"
    - "the complexity of generalized satisfiability for linear temporal logic"
    - "clausal temporal resolution"

Connected through hyperedge HE-8 (induced by source paper "strong backdoors for default logic"):
  with members:
    - "backdoors to normality for disjunctive logic programs"
    - "satisfiability of acyclic and almost acyclic cnf formulas"
    - "backdoors to abduction"
    - "backdoors to tractable answer set programming"
    - "the complexity of propositional implication"

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)