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     1   | 
     1   | 
         | 
     2 import CW7a._  | 
     2   | 
     3   | 
     3 val urban_list1 = List("a", "b", "b", "c", "d") | 
     4 val urban_list1 = List("a", "b", "b", "c", "d") | 
     4 val urban_list2 = List("d", "b", "d", "b", "d") | 
     5 val urban_list2 = List("d", "b", "d", "b", "d") | 
     5   | 
     6   | 
     6 assert(prod(urban_list1, urban_list2) == 7)  | 
     7 assert(prod(urban_list1, urban_list2) == 7)  | 
     7   | 
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     8 assert(prod(urban_list1, urban_list1) == 7)  | 
     8 assert(prod(urban_list1, urban_list1) == 7)  | 
     9   | 
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    10 assert(prod(urban_list2, urban_list2) == 13)  | 
     9 assert(prod(urban_list2, urban_list2) == 13)  |