prompt: Your task is to convert the following English description into an ASCII tree format.
  
  backends is a top-level directory that assembles 5 subdirectories. Notable ones include base, mysql, oracle among others.
  
  Let me break down the design for you:
  
  In the root directory, 'base' holds 1 subdirectories: app_unmigrated.
  At level 2, in directory path 'base → app_unmigrated', 'app_unmigrated' carries 1 folders: migrations.
  At level 3, in directory path 'base / app_unmigrated / migrations', 'migrations' is devoid of content.
  In the root directory, Inside 'mysql', you'll find it is unpopulated.
  In the root directory, 'oracle' appears to be unused.
  At the top level, Inside 'postgresql', you'll find it stands empty.
  At the top level, The 'sqlite' compartment appears to be unused.
  
  
  Format your response in this style:
  ```
  gradle
   +--api
   |   `--plugins
   |       `--catalog
   |           `--internal
   `--catalog
  ```
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "backends\n +--base\n |   `--app_unmigrated\n |       `--migrations\n +--mysql\n +--oracle\n +--postgresql\n `--sqlite", "description": "backends is a top-level directory that assembles 5 subdirectories. Notable ones include base, mysql, oracle among others.\n\nLet me break down the design for you:\n\nIn the root directory, 'base' holds 1 subdirectories: app_unmigrated.\nAt level 2, in directory path 'base \u2192 app_unmigrated', 'app_unmigrated' carries 1 folders: migrations.\nAt level 3, in directory path 'base / app_unmigrated / migrations', 'migrations' is devoid of content.\nIn the root directory, Inside 'mysql', you'll find it is unpopulated.\nIn the root directory, 'oracle' appears to be unused.\nAt the top level, Inside 'postgresql', you'll find it stands empty.\nAt the top level, The 'sqlite' compartment appears to be unused.\n"}