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tokens: The authors thank Vivien Bonvin, Patrick Kelly, and Tommaso Treu for very helpful discussions of this paper. We would also like to thank the referee for their insightful comments, which certainly strengthened this work. Support for this work was provided by NASA through grant No. HST -AR-15050 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555.