prompt: Your task is to convert an English description into an ASCII tree format using this style:
  ```
  plumbing
   +--cache
   +--color
   +--filemode
   +--format
   |   +--config
   |   +--diff
   |   +--gitignore
   |   +--idxfile
   |   +--index
   |   +--objfile
   |   +--packfile
   |   `--pktline
   +--hash
   +--object
   +--protocol
   |   `--packp
   |       +--capability
   |       `--sideband
   +--revlist
   +--storer
  ```
  
  Convert this description:
  
  patterns-dirs is a top-level directory that gathers 4 subdirectories. Notable ones include !dir, dir1, dir2 among others.
  
  Let me break down the system for you:
  
  In the root directory, Inside '!dir', you'll find it is a vacant space.
  At the top level, 'dir1' features 1 nested folders: nested1.
  Within directory hierarchy 'dir1 → nested1', Inside 'nested1', you'll find it is unpopulated.
  Back to the top level.
  In the root directory, 'dir2' groups 1 contained folders: nested2.
  At level 2, in directory path 'dir2 → nested2', Inside 'nested2', you'll find it has been left empty.
  At the main level, The 'empty' collection is blank.
  
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "patterns-dirs\n +--!dir\n +--dir1\n |   `--nested1\n +--dir2\n |   `--nested2\n `--empty", "description": "patterns-dirs is a top-level directory that gathers 4 subdirectories. Notable ones include !dir, dir1, dir2 among others.\n\nLet me break down the system for you:\n\nIn the root directory, Inside '!dir', you'll find it is a vacant space.\nAt the top level, 'dir1' features 1 nested folders: nested1.\nWithin directory hierarchy 'dir1 \u2192 nested1', Inside 'nested1', you'll find it is unpopulated.\nBack to the top level.\nIn the root directory, 'dir2' groups 1 contained folders: nested2.\nAt level 2, in directory path 'dir2 \u2192 nested2', Inside 'nested2', you'll find it has been left empty.\nAt the main level, The 'empty' collection is blank.\n"}