phpMarkdownExtraExtensions :: Set Extension
phpMarkdownExtraExtensions = Set.fromList
  [ Ext_footnotes
  , Ext_pipe_tables
  , Ext_raw_html
  , Ext_markdown_attribute
  , Ext_fenced_code_blocks
  , Ext_definition_lists
  , Ext_intraword_underscores
  , Ext_header_attributes
  , Ext_abbreviations
  ]
phpMarkdownExtraExtensions :: Set Extension
phpMarkdownExtraExtensions = Set.fromList
  [ Ext_footnotes
  , Ext_pipe_tables
  , Ext_raw_html
  , Ext_markdown_attribute
  , Ext_fenced_code_blocks
  , Ext_definition_lists
  , Ext_intraword_underscores
  , Ext_header_attributes
  , Ext_abbreviations
  ]
phpMarkdownExtraExtensions = Set.fromList
  [ Ext_footnotes
  , Ext_pipe_tables
  , Ext_raw_html
  , Ext_markdown_attribute
  , Ext_fenced_code_blocks
  , Ext_definition_lists
  , Ext_intraword_underscores
  , Ext_header_attributes
  , Ext_abbreviations
  ]