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knocking or hitting two pieces of metal together.
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Tapping a stick or finger against a surface.
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Door knock with two hands, frantic, quick.
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Knocking on plastic, multiple times
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Knocking a metal sheet, rhythmic
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Jingling handcuffs on a prisoner.
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Knocking on a wooden door or table.
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Tapping on a window X5
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Wooden Door - Hard knocking X7
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Door - Multiple knocks, insistent
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