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tokens: It is a pleasure to thank G. Bodo, M. Chandra, S. Davis, J. Dolence, J. Goodman, G. Lesur, V. Paschalidis, J. Simon, and J. Stone for useful discussions. We also thank the anonymous referee for a very useful report. The numerical calculations presented here were performed on the Blue Waters supercomputer at NCSA. B.R.R. was supported by an Illinois Distinguished Fellowship and by NSF grant AST-1333612. Work at Los Alamos National Laboratory was done under the auspices of the National Nuclear Security Administration of the US Department of Energy. C.F.G.’s work was also supported in part by a Romano Professorial Scholar appointment, a Simons Fellowship in Theoretical Physics, and a Visiting Fellowship at All Souls College, Oxford.