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: "the complexity of the list homomorphism problem for graphs"
  Abstract: We completely classify the computational complexity of the list H-colouring problem for graphs (with possible loops) in combinatorial and algebraic terms: for every graph H the problem is either NP-complete, NL-complete, L-complete or is first-order definable; descriptive complexity equivalents are given as well via Datalog and its fragments. Our algebraic characterisations match important conjectures in the study of constraint satisfaction problems.

Connected through hyperedge HE-1 (induced by source paper "parameterized algorithms for min max multiway cut and list digraph homomorphism"):
  with members:
    - "an fpt 2 approximation for tree cut decomposition"
    - "space complexity of list h colouring a dichotomy"
    - "list h coloring a graph by removing few vertices"
    - "minimum bisection is fixed parameter tractable"
    - "designing fpt algorithms for cut problems using randomized contractions"
    - "minimum k way cut of bounded size is fixed parameter tractable"
    - "finding small separators in linear time via treewidth reduction"
    - "fixed parameter tractability of directed multiway cut parameterized by the size of the cutset"

Connected through hyperedge HE-2 (induced by source paper "space complexity of list h coloring revisited the case of oriented trees"):
  with members:
    - "space complexity of list h colouring a dichotomy"
    - "list h coloring a graph by removing few vertices"
    - "the dichotomy of list homomorphisms for digraphs"
    - "minimum cost and list homomorphisms to semicomplete digraphs"

Connected through hyperedge HE-3 (induced by source paper "ordering with precedence constraints and budget minimization"):
  with members:
    - "list h coloring a graph by removing few vertices"

Connected through hyperedge HE-4 (induced by source paper "list h coloring a graph by removing few vertices"):
  with members:
    - "clustering with local restrictions"
    - "space complexity of list h colouring a dichotomy"
    - "faster parameterized algorithms using linear programming"
    - "fixed parameter tractability of multicut in directed acyclic graphs"
    - "directed subset feedback vertex set is fixed parameter tractable"
    - "finding small separators in linear time via treewidth reduction"
    - "fixed parameter tractability of directed multiway cut parameterized by the size of the cutset"
    - "on multiway cut parameterized above lower bounds"

Connected through hyperedge HE-5 (induced by source paper "space complexity of list h colouring a dichotomy"):
  with members:
    - "on the reduction of the csp dichotomy conjecture to digraphs"
    - "the dichotomy of list homomorphisms for digraphs"
    - "a characterisation of first order constraint satisfaction problems"

Connected through hyperedge HE-6 (induced by source paper "testing list h homomorphisms"):
  with members:
    - "optimal constant time approximation algorithms and unconditional inapproximability results for every bounded degree csp"
    - "the dichotomy of list homomorphisms for digraphs"
    - "a unified framework for testing linear invariant properties"

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)