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tokens: We thank Seshadri Nadathur, Shaun Hotchkiss, David Alonso, Airam Marcos-Caballero, Fabio Finelli, Francesco Paci, István Szapudi, and the anonymous referee for useful comments that improved the paper. We also thank Krishna Naidoo, Ofer Lahav, and Aurelien Benoit-Lévy for informative discussions. AK thanks Márton Vargyas, and JGB the Theory Division at CERN, for their hospitality, where the main ideas of the project were discussed. Funding for this project was provided by the Spanish Ministerio de Economía y Competitividad (MINECO) under projects FPA2012-39684, FPA2013-47986, and Centro de Excelencia Severo Ochoa SEV-2012-0234 and SEV-2012-0249.