Input: three or more containers:
- one touching top left corner
- inside it there are three monocolor objects
- one touching bottom right corner of toplevel box
- inside it there is one monocolor object
- outside of those, touching the left toplevel box edge, there is one or more point
Output:
- draw dotted path of perpendicular line
- the path color pattern comes from the color of top left objects, ordered from nearest to furthest from top le