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A runner tosses a cup near a water station during the 2017 Bank of America Chicago Marathon on  Oct. 8, 2017 in Chicago.
Nancy Stone / Chicago Tribune
A runner tosses a cup near a water station during the 2017 Bank of America Chicago Marathon on  Oct. 8, 2017 in Chicago.
Chicago Tribune
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Around 45,000 runners participated in the 2017 Bank of America Chicago Marathon on Oct. 8, 2017.