BOISE, IDAHO/USA – AUGUST 10: Unidentified gas masked runner splashes down at the start of the mud pit during the The Dirty Dash in Boise, Idaho on August 10, 2013

BOISE, IDAHO/USA – AUGUST 10: Unidentified gas masked runner splashes down at the start of the mud pit during the The Dirty Dash in Boise, Idaho on August 10, 2013

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BOISE, IDAHO/USA – AUGUST 10: Runner 8922 observes the course at the The Dirty Dash in Boise, Idaho on August 10, 2013 while he wears a gas mask

BOISE, IDAHO/USA – AUGUST 10: Runner 8922 observes the course at the The Dirty Dash in Boise, Idaho on August 10, 2013 while he wears a gas mask

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BOISE, IDAHO/USA – AUGUST 10: Runner 8919 walks with his with his gas mask on while competing at the The Dirty Dash in Boise, Idaho on August 10, 2013

BOISE, IDAHO/USA – AUGUST 10: Runner 8919 walks with his with his gas mask on while competing at the The Dirty Dash in Boise, Idaho on August 10, 2013

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