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tokens: We thank Peter Capak, Mark Dickinson, Jim Dunlop, Richard Ellis, Steve Finkelstein, Kristian Finlator, Jason Jaacks, Ross McLure, Ken Nagamine, Masami Ouchi, Rogier Windhorst, and Haojing Yan for valuable conversations. Feedback from our referee substantially improved this paper. We acknowledge the support of NASA grant NAG5-7697, NASA grant HST -GO-11563, ERC grant HIGHZ #227749, and a NWO vrij competitie grant 600.065.140.11N211. This research has benefitted from the SpeX Prism Spectral Libraries, maintained by Adam Burgasser at http://pono.ucsd.edu/~adam/browndwarfs/spexprism .