old_contents: from puzzle.heuristics.acrostics import _acrostic_iter
  
  
  # The "naive acrostic" is currently the best one available.
  class Acrostic(_acrostic_iter.Acrostic):
    """Best available Acrostic solver."""
    pass
  
new_contents: from puzzle.heuristics.acrostics import _acrostic_iter
  
  
  class Acrostic(_acrostic_iter.Acrostic):
    """Best available Acrostic solver."""
    pass
  
subject: Remove stale comment.