human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "colouring diamond free graphs"):
  Abstract: The Colouring problem is that of deciding, given a graph $G$ and an integer $k$, whether $G$ admits a (proper) $k$-colouring. For all graphs $H$ up to five vertices, we classify the computational complexity of Colouring for $(\mbox{diamond},H)$-free graphs. Our proof is based on combining known results together with proving that the clique-width is bounded for $(\mbox{diamond}, P_1+2P_2)$-free graphs. Our technique for handling this case is to reduce the graph under consideration to a $k$-partite graph that has a very specific decomposition. As a by-product of this general technique we are also able to prove boundedness of clique-width for four other new classes of $(H_1,H_2)$-free graphs. As such, our work also continues a recent systematic study into the (un)boundedness of clique-width of $(H_1,H_2)$-free graphs, and our five new classes of bounded clique-width reduce the number of open cases from 13 to 8.

Includes members:
  Member "the behavior of clique width under graph operations and graph transformations":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "clique width for graph classes closed under complementation")
  Member "induced minor free graphs isomorphism and clique width":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "graph isomorphism for h_1 h_2 free graphs an almost complete dichotomy")
  Member "bounding the clique width of h free chordal graphs":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "graph isomorphism for h_1 h_2 free graphs an almost complete dichotomy")
  Member "bounding the clique width of h free split graphs":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "graph isomorphism for h_1 h_2 free graphs an almost complete dichotomy")
  Member "bounding clique width via perfect graphs":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "graph isomorphism for h_1 h_2 free graphs an almost complete dichotomy")
  Member "clique width of graph classes defined by two forbidden induced subgraphs":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "theta triangle free and even hole k 4 free graphs part 2 bounds on treewidth")
  Member "classifying the clique width of h free bipartite graphs":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "on efficient domination for some classes of h free bipartite graphs")
  Member "a survey on the computational complexity of colouring graphs with forbidden subgraphs":
    also connected through other hyperedges:
      - Hyperedge HE-8 (induced by source paper "filling the complexity gaps for colouring planar and bounded degree graphs")

Question: Please tell me which class the source paper 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)