prompt: Your task is to convert an English description into an ASCII tree format using this style:
  ```
  logical-expression
   +--deopzimize-while-included
   +--mutate-logical-expression
   |   `--_expected
   `--simplify-non-boolean
  ```
  
  Convert this description:
  
  2.1-2 is a core directory that comprises 2 subdirectories: include and lib.
  At the main level, 'include' hosts 1 subdirectories: CUnit.
  At level 2, in directory path 'include / CUnit', 'CUnit' remains unused.
  In the root directory, The 'lib' directory encompasses 7 folders for code organization.
  At level 2, in directory path 'lib → cygwin', The 'cygwin' folder lacks any subdirectories.
  In nested path 'lib → linux', The 'linux' data structure has been left empty.
  In nested path 'lib / mingw', The 'mingw' collection contains no subdirectories.
  In nested path 'lib → osx', The 'osx' section sits empty.
  Within directory hierarchy 'lib > vs2010', Inside 'vs2010', you'll find it stands empty.
  Within directory hierarchy 'lib > vs2013', Inside 'vs2013', you'll find it has nothing inside.
  In nested path 'lib > vs2015', Inside 'vs2015', you'll find it is a vacant space.
  Back to the top level.
  
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "2.1-2\n +--include\n |   `--CUnit\n `--lib\n     +--cygwin\n     +--linux\n     +--mingw\n     +--osx\n     +--vs2010\n     +--vs2013\n     `--vs2015", "description": "2.1-2 is a core directory that comprises 2 subdirectories: include and lib.\nAt the main level, 'include' hosts 1 subdirectories: CUnit.\nAt level 2, in directory path 'include / CUnit', 'CUnit' remains unused.\nIn the root directory, The 'lib' directory encompasses 7 folders for code organization.\nAt level 2, in directory path 'lib \u2192 cygwin', The 'cygwin' folder lacks any subdirectories.\nIn nested path 'lib \u2192 linux', The 'linux' data structure has been left empty.\nIn nested path 'lib / mingw', The 'mingw' collection contains no subdirectories.\nIn nested path 'lib \u2192 osx', The 'osx' section sits empty.\nWithin directory hierarchy 'lib > vs2010', Inside 'vs2010', you'll find it stands empty.\nWithin directory hierarchy 'lib > vs2013', Inside 'vs2013', you'll find it has nothing inside.\nIn nested path 'lib > vs2015', Inside 'vs2015', you'll find it is a vacant space.\nBack to the top level.\n"}