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: "simultaneous pq ordering with applications to constrained embedding problems"
  Abstract: In this paper, we define and study the new problem Simultaneous PQ-Ordering. Its input consists of a set of PQ-trees, which represent sets of circular orders of their leaves, together with a set of child-parent relations between these PQ-trees, such that the leaves of the child form a subset of the leaves of the parent. Simultaneous PQ-Ordering asks whether orders of the leaves of each of the trees can be chosen simultaneously, that is, for every child-parent relation the order chosen for the parent is an extension of the order chosen for the child. We show that Simultaneous PQ-Ordering is NP-complete in general and that it is efficiently solvable for a special subset of instances, the 2-fixed instances. We then show that several constrained embedding problems can be formulated as such 2-fixed instances. #R##N#In particular, we obtain a linear-time algorithm for Partially PQ-Constrained Planarity for biconnected graphs, a common generalization of two recently considered embedding problems, and a quadratic-time algorithm for Simultaneous Embedding with Fixed Edges for biconnected graphs with a connected intersection; formerly only the much more restricted case that the intersection is biconnected was known to be efficiently solvable. Both results can be extended to the case where the input graphs are not necessarily biconnected but have the property that each cutvertex is contained in at most two non-trivial blocks. This includes for example the case where both graphs have maximum degree 5. Moreover, we give an optimal linear-time algorithm for recognition of simultaneous interval graphs, improving upon a recent O(n^2 log n)-time algorithm due to Jampani and Lubiw and show that this can be used to also solve the problem of extending partial interval representations of graphs with n vertices and m edges in time O(n + m), improving a recent result of Klav\'ik et al.

Connected through hyperedge HE-1 (induced by source paper "atomic embeddability clustered planarity and thickenability"):
  with members:
    - "recognizing weak embeddings of graphs"
    - "hanani tutte for approximating maps of graphs"
    - "clustered planarity with pipes"
    - "recognizing weakly simple polygons"
    - "detecting weakly simple polygons"
    - "simultaneous embedding edge orderings relative positions cutvertices"
    - "clustered planarity testing revisited"
    - "simultaneous embedding of planar graphs"

Connected through hyperedge HE-2 (induced by source paper "the quasefe problem"):
  with members:
    - "a survey on graph drawing beyond planarity"
    - "simultaneous drawing of planar graphs with right angle crossings and few bends"
    - "simultaneous visibility representations of plane st graphs using l shapes"
    - "advancements on sefe and partitioned book embedding problems"
    - "simultaneous embedding of planar graphs"
    - "testing simultaneous planarity when the common graph is 2 connected"
    - "on a tree and a path with no geometric simultaneous embedding"

Connected through hyperedge HE-3 (induced by source paper "simultaneous fpq ordering and hybrid planarity testing"):
  with members:
    - "graph planarity testing with hierarchical embedding constraints"
    - "computing k modal embeddings of planar digraphs"
    - "turning cliques into paths to achieve planarity"
    - "nodetrix planarity testing with small clusters"
    - "computing nodetrix representations of clustered graphs"
    - "intersection link representations of graphs"
    - "beyond level planarity"

Connected through hyperedge HE-4 (induced by source paper "simultaneous representation of proper and unit interval graphs"):
  with members:
    - "a note on simultaneous representation problem for interval and circular arc graphs"
    - "extending partial representations of circle graphs"
    - "extending partial representations of proper and unit interval graphs"
    - "simultaneous embedding of planar graphs"
    - "simultaneous interval graphs"

Connected through hyperedge HE-5 (induced by source paper "graph planarity testing with hierarchical embedding constraints"):
  with members:
    - "a new perspective on clustered planarity as a combinatorial embedding problem"
    - "intersection link representations of graphs"

Connected through hyperedge HE-6 (induced by source paper "hierarchical partial planarity"):
  with members:
    - "simultaneous orthogonal planarity"
    - "simultaneous drawing of planar graphs with right angle crossings and few bends"
    - "planarity of streamed graphs"
    - "drawing partially embedded and simultaneously planar graphs"
    - "streamed graph drawing and the file maintenance problem"
    - "advancements on sefe and partitioned book embedding problems"
    - "picking planar edges or drawing a graph with a planar subgraph"
    - "algorithms and bounds for drawing non planar graphs with crossing free subgraphs"

Connected through hyperedge HE-7 (induced by source paper "hanani tutte for approximating maps of graphs"):
  with members:
    - "recognizing weak embeddings of graphs"
    - "bounded embeddings of graphs in the plane"
    - "clustered planarity with pipes"
    - "embedding graphs into embedded graphs"
    - "detecting weakly simple polygons"
    - "powers of tensors and fast matrix multiplication"
    - "toward the hanani tutte theorem for clustered graphs"
    - "clustered planarity testing revisited"

Connected through hyperedge HE-8 (induced by source paper "clustered planarity with pipes"):
  with members:
    - "subexponential time and fpt algorithms for embedded flat clustered planarity"
    - "recognizing weak embeddings of graphs"
    - "hanani tutte for approximating maps of graphs"
    - "c planarity of embedded cyclic c graphs"
    - "embedding graphs into embedded graphs"
    - "a new perspective on clustered planarity as a combinatorial embedding problem"
    - "detecting weakly simple polygons"
    - "toward the hanani tutte theorem for clustered graphs"

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)