old_contents: from stack import Stack
  from max import Max
  from magnify import Magnify
  from tile import Tile
  from clientstack import ClientStack
  
  # sublayouts
  from subtile import SubTile
  from submax import SubMax
  from hybridlayoutdemo import HybridLayoutDemo
  
new_contents: from stack import Stack
  from max import Max
  from magnify import Magnify
  from tile import Tile
  from clientstack import ClientStack
  
  from base import Rect
  
  # sublayouts
  from subtile import SubTile
  from submax import SubMax
  from hybridlayoutdemo import HybridLayoutDemo
  
subject: Add Rect to layout module __init__