Leah Williamson, left, and her twin 7-year-old children Carpenter Adoo, center, and Sira Joy Adoo jump on the icy, frozen ground outside their home on Saturday, Feb. 13, 2021, in Memphis, Tenn. Carpenter's medical condition makes him particularly vulnerable to COVID-19, putting him in a population that states are wrestling with how to prioritize as vaccine supplies fall short of demand. Tennessee last month joined a handful of states in moving the families of medically frail children like Carpenter up the vaccine priority list. (AP Photo/Adrian Sainz)
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