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In page Marathon:

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Some charities seek to associate with various races. Some marathon organizers set aside a portion of their limited entry slots for charity organizations to sell to members in exchange for donations. Runners are given the option to sign up to run particular races, especially when marathon entries are no longer available to the general public.[citation needed] In some cases, charities organize their own marathon as a fund-raiser, gaining funds via entry fees or sponsorships.[citation needed]