prompt: Your task is to convert the following English description into an ASCII tree format.
  
  dsl is a parent directory that contains 3 subdirectories: docbook, links and source.
  In the root directory, 'docbook' includes 1 directory entries: model.
  In nested path 'docbook > model', Inside 'model', you'll find it holds no subdirectories at the moment.
  Back to the top level.
  At the top level, 'links' is vacant.
  At the top level, 'source' includes 1 contained folders: model.
  In nested path 'source / model', The 'model' folder remains unused.
  
  
  Format your response in this style:
  ```
  tests
   +--helpers
   |   `--browser
   +--regression
   |   `--libs
   +--test262
   |   `--test262
   `--unit
       `--fixtures
  ```
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "dsl\n +--docbook\n |   `--model\n +--links\n `--source\n     `--model", "description": "dsl is a parent directory that contains 3 subdirectories: docbook, links and source.\nIn the root directory, 'docbook' includes 1 directory entries: model.\nIn nested path 'docbook > model', Inside 'model', you'll find it holds no subdirectories at the moment.\nBack to the top level.\nAt the top level, 'links' is vacant.\nAt the top level, 'source' includes 1 contained folders: model.\nIn nested path 'source / model', The 'model' folder remains unused.\n"}