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| Edison's invention is de-light-ful. |
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| Edison's process of illumination. |
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| Spencer Tracy, Light entertainer. |
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| Spencer Tracy: patently smart. |
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| Edison's invention is illuminating. |
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| Edison emphasizes current events. |
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| Menlo Park Wizard reminisces. |
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| Tracy's most electrifying performance. |
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| Tom provides light entertainment. |
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| Tracy illuminates Edison's life. |
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| Edison has phonographic memory. |
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