old_contents: def primitive_triplets():
      pass
  
  
  def triplets_in_range():
      pass
  
  
  def is_triplet():
      pass
  
new_contents: def primitive_triplets(number_in_triplet):
      pass
  
  
  def triplets_in_range(range_start, range_end):
      pass
  
  
  def is_triplet(triplet):
      pass
  
subject: Add parameters to exercise placeholder per #703