When you're investigating an issue or bug with orphans

Step-by-step guide

Create a course in Studio
Add a unit and two problems to that unit
Publish the course
Export the course
In XML, find the vertical: https://www.dropbox.com/s/cvug7srkm2rpjyq/Screenshot%202015-08-17%2014.48.41.png?dl=0
Remove the pointer to the second problem: https://www.dropbox.com/s/k2czgz3glh3jde8/Screenshot%202015-08-17%2014.49.17.png?dl=0
Tar the course (tar -czvf <name_of_tar>.tar.gz dir_to_tar/)
Re-import the course
Voilà, the second problem is no longer in the course tree, but hasn't been removed from the course.
To verify, in studio, go to /orphan/<course_id>

Note: exporting a course walks the course tree, so if you export a course with orphans, and import it into a new course, that new course won't have any orphans. If you want to play around with a course that currently has orphans in a safe way, you should rerun the course–that does preserve orphans.

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