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digital:thing,
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digital:medium,
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portable:appliance,
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digital:audio,
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digital:signal,
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electronic:device,
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digital:object,
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portable:system,
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continuous:medium,
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new:medium,
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digital:content,
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needed:equipment,
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special:signal,
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basic:equipment,
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magnetic:medium,
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broadband:content,
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portable:device,
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multiple:medium,
Category Nuances for digital_audio:
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digital,
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basic,
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portable,
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electronic,
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special,
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needed,
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continuous,
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broadband,
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multiple,
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magnetic,
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new,
Simple Categories for digital_audio:
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device,
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system,
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medium,
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content,
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signal,
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object,
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appliance,
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thing,
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equipment,
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audio,