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tokens: ACKNOWLEDGEMENTS This research has been supported by Arizona State University. We would like to thank Soma De, Tanmay Vachaspati, Daniel C. Jacobs, Adam Beardsley and Samuel Gordon for their insightful conversations. Some of the results in this paper have been derived using the healpix (Górski et al. 2005 ) package. This research made use of astropy , a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013 ).