prompt: Your task is to convert the following English description into an ASCII tree format.
  
  npm is a source directory that incorporates 3 subdirectories: app, node_modules and pages.
  At the top level, Within 'app', you'll find 1 directories for code structure.
  In nested path 'app → _peer-deps', The '_peer-deps' repository contains no subdirectories.
  Back to the top level.
  At the top level, 'node_modules' incorporates 2 packages: css, package-with-optional-deps.
  At level 2, in directory path 'node_modules → css', 'css' is barren.
  In nested path 'node_modules → package-with-optional-deps', Inside 'package-with-optional-deps', you'll find it sits empty.
  At the top level, 'pages' appears to be unused.
  
  
  Format your response in this style:
  ```
  docs
   +--dsl
   |   +--docbook
   |   |   `--model
   |   +--links
   |   `--source
   |       `--model
   `--model
  ```
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "npm\n +--app\n |   `--_peer-deps\n +--node_modules\n |   +--css\n |   `--package-with-optional-deps\n `--pages", "description": "npm is a source directory that incorporates 3 subdirectories: app, node_modules and pages.\nAt the top level, Within 'app', you'll find 1 directories for code structure.\nIn nested path 'app \u2192 _peer-deps', The '_peer-deps' repository contains no subdirectories.\nBack to the top level.\nAt the top level, 'node_modules' incorporates 2 packages: css, package-with-optional-deps.\nAt level 2, in directory path 'node_modules \u2192 css', 'css' is barren.\nIn nested path 'node_modules \u2192 package-with-optional-deps', Inside 'package-with-optional-deps', you'll find it sits empty.\nAt the top level, 'pages' appears to be unused.\n"}