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Participants in the men's wheelchair division break from the starting line of the 125th Boston Marathon. (Mary Schwalm/AP)Manuela Schär, of Switzerland, smiles while breaking the finish line to win the women's wheelchair division at the Boston Marathon in Boston, Monday, Oct. 11, 2021. (Charles Krupa/AP)The elite men's division crossing the starting line in Hopkinton during the 2021 Boston Marathon. (Robin Lubbock/WBUR)