Instructors should note that the migration of the RT labs to Markdown cause a problem with placement of 
of images. The file exercises-rt-lab1.en.md includes the images in the correct place, but they will 
often appear AFTER the explanatory text. 

This can be VERY CONFUSING to the participants. It is suggested that you show an example of this 
before participants begin exercises and stress that they should read ahead.

Exercise 4 is a good example to use.
