old_contents: """
  File that initializes a Writer object designed for GitHub style markdown files.
  """
  
  from anchorhub.writer import Writer
  from anchorhub.builtin.github.wstrategies import MarkdownATXWriterStrategy, \
      MarkdownSetextWriterStrategy, MarkdownInlineLinkWriterStrategy
  import anchorhub.builtin.github.switches as ghswitches
  
  
  def make_github_markdown_writer(opts):
      """
      Creates a Writer object used for parsing and writing Markdown files with
      a GitHub style anchor transformation
  
      :param opts:
      :return: A Writer object designed for parsing, modifying, and writing
      AnchorHub tags to converted anchors in Markdown files using GitHub style
      anchors
      """
      assert hasattr(opts, 'wrapper_regex')
      atx = MarkdownATXWriterStrategy(opts)
      setext = MarkdownSetextWriterStrategy(opts)
      inline = MarkdownInlineLinkWriterStrategy(opts)
      code_block_switch = ghswitches.code_block_switch
  
      strategies = [atx, setext, inline]
      switches = [code_block_switch]
  
      return Writer(strategies, switches=switches)
new_contents: """
  File that initializes a Writer object designed for GitHub style markdown files.
  """
  
  from anchorhub.writer import Writer
  from anchorhub.builtin.github.wstrategies import MarkdownATXWriterStrategy, \
      MarkdownSetextWriterStrategy, MarkdownInlineLinkWriterStrategy, \
      MarkdownReferenceLinkWriterStrategy
  import anchorhub.builtin.github.switches as ghswitches
  
  
  def make_github_markdown_writer(opts):
      """
      Creates a Writer object used for parsing and writing Markdown files with
      a GitHub style anchor transformation
  
      :param opts:
      :return: A Writer object designed for parsing, modifying, and writing
      AnchorHub tags to converted anchors in Markdown files using GitHub style
      anchors
      """
      assert hasattr(opts, 'wrapper_regex')
      atx = MarkdownATXWriterStrategy(opts)
      setext = MarkdownSetextWriterStrategy(opts)
      inline = MarkdownInlineLinkWriterStrategy(opts)
      ref = MarkdownReferenceLinkWriterStrategy(opts)
      code_block_switch = ghswitches.code_block_switch
  
      strategies = [atx, setext, inline, ref]
      switches = [code_block_switch]
  
      return Writer(strategies, switches=switches)
subject: Use MarkdownReferenceLinkWriterStrategy in writer