old_contents: from puzzle.heuristics.acrostics import _acrostic_iter
  
  
  class Acrostic(_acrostic_iter.AcrosticIter):
    """Best available Acrostic solver."""
    pass
  
new_contents: from puzzle.heuristics.acrostics import _acrostic_search
  
  
  class Acrostic(_acrostic_search.AcrosticSearch):
    """Best available Acrostic solver."""
    pass
  
subject: Use AccrosticSearch (~BFS) instead of AcrosticIter (~DFS).