prompt: Your task is to convert an English description into an ASCII tree format using this style:
  ```
  next-after-pages
   +--pages
   |   +--middleware
   |   |   `--redirect
   |   `--pages-dir
   |       `--[id]
   `--utils
  ```
  
  Convert this description:
  
  sites is a principal directory that contains 3 subdirectories: _shared_static, docs and www.
  At the top level, '_shared_static' remains unused.
  At the top level, 'docs' includes 2 subdirectories: api, concepts.
  At level 2, in directory path 'docs → api', Inside 'api', you'll find it awaits content.
  At level 2, in directory path 'docs → concepts', The 'concepts' data structure has yet to be populated.
  At the top level, The 'www' data structure has no folders inside.
  
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "sites\n +--_shared_static\n +--docs\n |   +--api\n |   `--concepts\n `--www", "description": "sites is a principal directory that contains 3 subdirectories: _shared_static, docs and www.\nAt the top level, '_shared_static' remains unused.\nAt the top level, 'docs' includes 2 subdirectories: api, concepts.\nAt level 2, in directory path 'docs \u2192 api', Inside 'api', you'll find it awaits content.\nAt level 2, in directory path 'docs \u2192 concepts', The 'concepts' data structure has yet to be populated.\nAt the top level, The 'www' data structure has no folders inside.\n"}