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: "combinatorial optimization in pattern assembly"
  Abstract: Pattern self-assembly tile set synthesis (PATS) is a combinatorial optimization problem which aim at minimizing a rectilinear tile assembly system (RTAS) that uniquely self-assembles a given rectangular pattern, and is known to be NP-hard. PATS gets practically meaningful when it is parameterized by a constant c such that any given pattern is guaranteed to contain at most c colors (c-PATS). We first investigate simple patterns and properties of minimum RTASs for them. Then based on them, we design a 59-colored pattern to which 3SAT is reduced, and prove that 59-PATS is NP-hard.

Connected through hyperedge HE-1 (induced by source paper "the complexity of fixed height patterned tile self assembly"):
  with members:
    - "binary pattern tile set synthesis is np hard"
    - "intrinsic universality and the computational power of self assembly"
    - "synthesizing minimal tile sets for patterned dna self assembly"

Connected through hyperedge HE-2 (induced by source paper "binary pattern tile set synthesis is np hard"):
  with members:
    - "a manually checkable proof for the np hardness of 11 color pattern self assembly tile set synthesis"
    - "search methods for tile sets in patterned dna self assembly"
    - "3 color bounded patterned self assembly"
    - "the two handed tile assembly model is not intrinsically universal"
    - "intrinsic universality in tile self assembly requires cooperation"
    - "intrinsic universality and the computational power of self assembly"
    - "one tile to rule them all simulating any turing machine tile assembly system or tiling system with a single puzzle piece"
    - "the tile assembly model is intrinsically universal"

Connected through hyperedge HE-3 (induced by source paper "search methods for tile sets in patterned dna self assembly"):
  with members:
    - "synthesizing minimal tile sets for patterned dna self assembly"

Connected through hyperedge HE-4 (induced by source paper "staged self assembly and polyomino context free grammars"):
  with members:
    - "the two handed tile assembly model is not intrinsically universal"
    - "intrinsic universality and the computational power of self assembly"
    - "approximation of grammar based compression via recompression"
    - "fuel efficient computation in passive self assembly"
    - "one tile to rule them all simulating any turing machine tile assembly system or tiling system with a single puzzle piece"
    - "inapproximability of the smallest superpolyomino problem"
    - "parallelism and time in hierarchical self assembly"
    - "the tile assembly model is intrinsically universal"

Connected through hyperedge HE-5 (induced by source paper "3 color bounded patterned self assembly"):
  with members:
    - "binary pattern tile set synthesis is np hard"
    - "synthesizing minimal tile sets for patterned dna self assembly"

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)