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: "squares of 3 sun free split graphs"
  Abstract: AbstractThesquareofagraphG,denotedbyG 2 ,isobtainedfromGbyputtinganedge between twodistinct verticeswhenevertheirdistanceis two. ThenG is called a square root of G 2 . Deciding whether a given graph has asquarerootisknowntobeNP-complete,eveniftherootisrequiredtobeasplit graph,thatis,agraphinwhichthevertexsetcanbepartitionedintoastablesetandaclique.Wegiveawiderangeofpolynomialtimesolvablecasesfortheproblemofrecognizing ifagivengraph isthesquareofsomespecial kindofsplitgraph. To the best of our knowledge, our result properly contains allpreviously known such cases. Ourpolynomial time algorithms are buildonastructuralinvestigationofgraphsthatadmitasplitsquarerootthatis 3-sun-free, and may pave the way toward a dichotomy theorem forrecognizingsquaresof(3-sun-free)splitgraphs.Keywords: Squareofgraphs,squareofsplitgraphs.2010 MSC:05C75,05C85. 1 Introduction The k-th power of a graph G, written G k , is obtained from G by adding newedges between any two diﬀerent vertices at distance at most k in G. In casek= 2, G

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)