old_contents: class EmblemFreq:
      def __init__(self, emblems):
          self._emblems = emblems
  
      @staticmethod
      def map_fn(item_list):
          return [(item, 1) for item in item_list]
  
      @staticmethod
      def reduce_fn(item_mapping):
          item_key, item_values = item_mapping
          return item_key, sum(item_values)
  
new_contents: class EmblemFreq:
      @staticmethod
      def map_fn(item_list):
          return [(item, 1) for item in item_list]
  
      @staticmethod
      def reduce_fn(item_mapping):
          item_key, item_values = item_mapping
          return item_key, sum(item_values)
  
subject: remove unused initializer.