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In this Tuesday, Dec. 14, 2016, photo, runners and dogs jog on a trail at Westchester Lagoon in Anchorage, Alaska. With ice present on city streets for up to seven months per year, most walkers and runners use footwear that has built-in studs or attached cleats as a safety measure to avoid falling. (AP Photo/Dan Joling)

In this Tuesday, Dec. 14, 2016, photo, runners and dogs jog on a trail at Westchester Lagoon in Anchorage, Alaska. With ice present on city streets for up to seven months per year, most walkers and runners use footwear that has built-in studs or attached cleats as a safety measure to avoid falling. (AP Photo/Dan Joling)

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