The point of this exercise is that student learn how to work smarter.
Encourage students to think before they start replacing dot with tree everywhere, as that is harder, not smarter.
The smarter way to do this is as follows:

1. Add import Extras.Examples
2. Remove dot from everywhere using the replace keyboard shortcut (Shift-Ctrl-F), replace: "dot", with: [just press Enter]
3. Move the list of points to a variable: points = [(0,10),...]
4. Rewrite the program line as program = drawingOf(combined(distributed(exampleCloud,points)))
5. Replace exampleCloud with exampleWhatever.

Monitor students as they work on this and identify some students who do it the way described above. They will probably finish earlier than the rest.
Then, have them explain to the class how they did it.
If no student does it the smarter way, you will need to jump in and demonstrate it yourself.
It is important that students understand that the purpose of working smarter is to accomplish a task doing less work.