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tokens: We thank Paul Duffell, Chris Matzner, and Frank Timmes for useful discussions. This research was funded by the Gordon and Betty Moore Foundation through grant GBMF5076. E.R.C. acknowledges support from NASA through the Einstein Fellowship Program, grant PF6-170170. E.Q. thanks the theoretical astrophysics group and the Moore Distinguished Scholar program at Caltech for their hospitality and support. This work was supported in part by a Simons Investigator Award from the Simons Foundation. The software used in this work was developed in part by the DOE NNSA-ASC OASCR Flash Center at the University of Chicago. Software: FLASH (Fryxell et al. 2000 ).