old_contents: from .core import *
  from .builtin import *
  from .cpotential import *
  from .cbuiltin import *
  from .custom import *
  
new_contents: from .core import *
  from .builtin import *
  from .cpotential import *
  from .cbuiltin import *
  from .custom import *
  from .io import *
  
subject: read write shit