code: def print_summary_stats(counter):
      
      sum = 0     # Sum of labeled WriterStrategy modifications
      u_sum = 0   # Sum of unlabeled WriterStrategy modifications
      for c in counter:
          if c[1] is not None and c[0] > 0:
              print("Total " + c[1] + " modified:\t" + str(c[0]))
              sum += c[0]
          else:
              u_sum += c[0]
      if u_sum > 0:
          print("Unlabeled modifications: \t" + str(u_sum))
      print("Total modifications: \t\t" + str(sum + u_sum))
docs: Prints summary statistics about which writer strategies were used,
      and how much they were used.
  
      :param counter: A list of lists. The first entry on the inner list is a
          number count of how many times a WriterStrategy was used, and the
          second entry is a string label describing the WriterStrategy