new_contents: import numpy as np
  from key import Key
  
  def remove_duplicates(values):
      output = []
      seen = []
      for value in values:
          if not np.any([np.all(value == x) for x in seen]):
              output.append(value)
              seen.append(value)
      return output
  
  def key_proliferation(input_keys):
      dt = np.dtype(object)
      key_list = [x.array_swap() for x in input_keys]
      map_list = []
      for list in key_list:
          for key in list:
              map_list.append(key.map)
      filtered_map_list = remove_duplicates(map_list)
      filtered_key_list = [Key(x) for x in filtered_map_list]
      return filtered_key_list
  
subject: Develop key_proliferate function to create new keys.