| 82 |      1 | 
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| 99 |      2 | val urban_prices = List(List(Some(71.539941), None), 
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|  |      3 |                         List(Some(76.974614), None), 
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|  |      4 |                         List(Some(65.226685), Some(6.35)), 
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|  |      5 |                         List(Some(78.354649), Some(12.241)), 
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|  |      6 |                         List(Some(85.517645), Some(38.188)))
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|  |      7 | 
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|  |      8 | val urban_deltas = List(List(Some(0.07596697626574789), None), 
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|  |      9 |                         List(Some(-0.152620823795232), None), 
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|  |     10 |                         List(Some(0.20126676681483952), Some(0.9277165354330709)), 
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|  |     11 |                         List(Some(0.09141762603007778), Some(2.119679764725104)))
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|  |     12 | 
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|  |     13 | 
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| 169 |     14 | assert (get_deltas(get_prices(List("IBM", "BIDU"), 2004 to 2008)) == urban_deltas)
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| 82 |     15 | 
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