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A soft door knock
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Knocking on the wood frame of a glass door, single knock
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Hotel room bathroom door knock
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Knocking on a school hallway door
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Double tap on a window, thick pane
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Knocking a wood door, heavy and reverberant
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Knocking on wood in triplets three times
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Knocking on wood dully in a series
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Knocking on wood authoritatively twice
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Knocking on an old antique wood glass door with a buzz 3