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Dragging plywood over rock salt
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Sheet of plywood hits cement. Impact with scrape and rattle.
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Plywood hitting a gritty concrete surface.
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Plywood hitting cement with gravel or gritty surface.
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Small pebbles, bouncing then settling on plywood.
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Plywood hits then settles on hollow wood surface.
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Glass bottle rolling off plywood and dropping onto gravel.
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Dragging plywood over rock salt
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Plywood impacts with hollow wood. Sharp impact.
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Small sand or gravel, dropped onto plywood.
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