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MIAMI, FLORIDA - DECEMBER 28:  Head coach Erik Spoelstra of the Miami Heat asks for a challenge against the Philadelphia 76ers during the second half at American Airlines Arena on December 28, 2019 in Miami, Florida. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Michael Reaves/Getty Images)