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: "an aperiodic set of 11 wang tiles"
  Abstract: A new aperiodic tile set containing 11 Wang tiles on 4 colors is presented. This tile set is minimal in the sense that no Wang set with less than 11 tiles is aperiodic, and no Wang set with less than 4 colors is aperiodic.

Connected through hyperedge HE-1 (induced by source paper "np completeness of the game kingdomino"):
  with members:
    - "monte carlo methods for the game kingdomino"
    - "hanabi is np complete even for cheaters who look at their cards"
    - "bejeweled candy crush and other match three games are np hard"
    - "candy crush is np hard"
    - "the computational complexity of the game of set and its theoretical applications"
    - "domino tatami covering is np complete"
    - "classic nintendo games are computationally hard"

Connected through hyperedge HE-2 (induced by source paper "slopes of 3 dimensional subshifts of finite type"):
  with members:
    - "characterizations of periods of multidimensional shifts"
    - "yet another aperiodic tile set"
    - "slopes of tilings"
    - "fixed point tile sets and their applications"

Connected through hyperedge HE-3 (induced by source paper "an output sensitive algorithm for the minimization of 2 dimensional string covers"):
  with members:
    - "procedural wang tile algorithm for stochastic wall patterns"

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.DM(Discrete Mathematics)