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Knocking on hollow bedroom door
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Knocking on office window, thick glass
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Door knock x5, hard hits on wood
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Knocking on a glass surface in a bathroom.
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Knock Gently on Thin wooden bedroom door Series
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Tin can knocks over and rolls
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Tapping on a window, Do da da do do
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Tapping on a window or thin door X5
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Knocking a toy chest, light
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knocking or hitting two pieces of metal together.