text: from countries.Countries import Countries
  
  
  class NorthAmerica(Countries):
      def __init__(self):
          super().__init__()
          self.lst_of_countries = ['Canada', 'United States']
          self.all_papers = self.get_all_papers()
  
  
  if __name__ == "__main__":
      a = NorthAmerica()
      papers = a.all_papers
      print(len(papers))
      # print(dict(sorted(a.get_themes_distribution_secondary().items(), key=lambda x: x[1], reverse=True)))
      # print(a.get_watercode_distribution_secondary())
  