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130
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//println("starting test now")
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/*
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import scala.concurrent._
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import scala.concurrent.duration._
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import ExecutionContext.Implicits.global
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import scala.language.postfixOps 
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val urban_prices = List(List(Some(71.539941), None), 
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                        List(Some(76.974614), None), 
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                        List(Some(65.226685), Some(6.35)), 
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                        List(Some(78.354649), Some(12.241)), 
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                        List(Some(85.517645), Some(38.188)))
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val urban_prices = List(List(Some(311.349976), Some(27.505054)), 
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			List(Some(300.222351), Some(42.357094)), 
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			List(Some(330.555054), Some(52.852215)))
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    19  | 
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199
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assert(get_deltas(urban_prices) == List(List(Some(-0.03573992567129673), Some(0.5399749442411563)), 
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                                        List(Some(0.10103412653643493), Some(0.2477771728154912))))
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