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A person walking on gritty concrete and debris
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Concrete slab scraping on wood
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Runners running on concrete and sliding fast.
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Bare feet stepping on concrete in a shuffle.
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Feet running on concrete, single step.
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Feet running up concrete, slowly.
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Feet running up concrete, slowly.
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Runners running on concrete and sliding with a metal ringing.
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Grenade - pin being pulled.
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Grenade - landing on concrete.
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