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import C2._
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val urban_list1 = List("a", "b", "b", "c", "d")
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val urban_list2 = List("d", "b", "d", "b", "d")
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assert(prod(urban_list1, urban_list2) == 7)
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assert(prod(urban_list1, urban_list1) == 7)
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assert(prod(urban_list2, urban_list2) == 13)