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Do I need permission to use a Google N-Gram?

No, but please make sure that you cite Jean-Baptiste Michel, Yuan Kui Shen, Aviva Presser Aiden, Adrian Veres, Matthew K. Gray, The Google Books Team, Joseph P. Pickett, Dale Hoiberg, Dan Clancy, Peter Norvig, Jon Orwant, Steven Pinker, Martin A. Nowak, and Erez Lieberman Aiden. (2010) Quantitative analysis of culture using millions of digitized books. Science. Published Online Ahead of Print: 12/16/2010 DOI: 10.1126/science.1199644 www.sciencemag.org/content/early/2010/12/15/science.1199644