tokens: We thank John Beacom, Keith Bechtol, Chris Belczynski, Michal Dominik, Alex Drlica-Wagner, Jennifer Johnson, Vicky Kalogera, Paul Lasky, Adam Martin, Grant Mathews, Annika Peter, Kris Sigurdson, Rebecca Surman, Todd Thompson, and MacKenzie Warren for helpful discussions, and the ABHM Workshop for their hospitality while this work was completed. J.B. thanks the Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1066293. T.L. is supported by the National Aeronautics and Space Administration through Einstein Postdoctoral Fellowship Award No. PF3-140110.
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