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 straight line rac drawing problem is np hard"
  Abstract: Recent cognitive experiments have shown that the negative impact of an edge crossing on the human understanding of a graph drawing, tends to be eliminated in the case where the crossing angles are greater than 70 degrees. This motivated the study of RAC drawings, in which every pair of crossing edges intersects at right angle. In this work, we demonstrate a class of graphs with unique RAC combinatorial embedding and we employ members of this class in order to show that it is NP-hard to decide whether a graph admits a straight-line RAC drawing.

Connected through hyperedge HE-1 (induced by source paper "rac drawings in subcubic area"):
  with members:
    - "a survey on graph drawing beyond planarity"
    - "on rac drawings of graphs with one bend per edge"

Connected through hyperedge HE-2 (induced by source paper "graphs with large total angular resolution"):
  with members:
    - "a heuristic approach towards drawings of graphs with high crossing resolution"
    - "maximizing the total resolution of graphs"
    - "notes on large angle crossing graphs"

Connected through hyperedge HE-3 (induced by source paper "a survey on graph drawing beyond planarity"):
  with members:
    - "parameterized complexity of 1 planarity"
    - "minimum weight connectivity augmentation for planar straight line graphs"
    - "compact drawings of 1 planar graphs with right angle crossings and few bends"
    - "drawing subcubic 1 planar graphs with few bends few slopes and large angles"
    - "turning cliques into paths to achieve planarity"
    - "a heuristic approach towards drawings of graphs with high crossing resolution"
    - "on rac drawings of graphs with one bend per edge"
    - "recognizing optimal 1 planar graphs in linear time"

Connected through hyperedge HE-4 (induced by source paper "a heuristic approach towards drawings of graphs with high crossing resolution"):
  with members:
    - "a survey on graph drawing beyond planarity"
    - "geodesic obstacle representation of graphs"
    - "a greedy heuristic for crossing angle maximization"
    - "nic planar graphs"
    - "on the edge length ratio of outerplanar graphs"
    - "recognizing and drawing ic planar graphs"
    - "maximizing the total resolution of graphs"
    - "notes on large angle crossing graphs"

Connected through hyperedge HE-5 (induced by source paper "on rac drawings of graphs with one bend per edge"):
  with members:
    - "a survey on graph drawing beyond planarity"
    - "nic planar graphs"
    - "on the density of non simple 3 planar graphs"
    - "recognizing and drawing ic planar graphs"
    - "the density of fan planar graphs"
    - "on the number of edges of fan crossing free graphs"

Connected through hyperedge HE-6 (induced by source paper "recognizing optimal 1 planar graphs in linear time"):
  with members:
    - "parameterized complexity of 1 planarity"
    - "a reduction system for optimal 1 planar graphs"
    - "recognizing and drawing ic planar graphs"
    - "on 4 map graphs and 1 planar graphs and their recognition problem"
    - "on the recognition of fan planar and maximal outer fan planar graphs"
    - "adding one edge to planar graphs makes crossing number and 1 planarity hard"

Connected through hyperedge HE-7 (induced by source paper "a greedy heuristic for crossing angle maximization"):
  with members:
    - "experimental evaluation of book drawing algorithms"
    - "networkit a tool suite for large scale complex network analysis"
    - "maximizing the total resolution of graphs"
    - "notes on large angle crossing graphs"

Connected through hyperedge HE-8 (induced by source paper "beyond planarity density results for bipartite graphs"):
  with members:
    - "recognizing optimal 1 planar graphs in linear time"
    - "on the relationship between k planar and k quasi planar graphs"
    - "an annotated bibliography on 1 planarity"
    - "two planar graphs are quasiplanar"
    - "on the density of non simple 3 planar graphs"
    - "recognizing and drawing ic planar graphs"
    - "on the recognition of fan planar and maximal outer fan planar graphs"
    - "the density of fan planar 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)