PS, if you are viewing the problem in the Library Browser, there is a little icon that looks like crossing arrows. That will re-randomize the problem, so that is one way to get several versions of the problem. Also, the PG editor that you get from the "Edit2" button (not the File Manager editor) has a place where you can set the random seed value and view the problem again. That is not quite so easy, but does let you do it from the editor, which is nice.
PREP 2015 Question Authoring - Archived
New version button/Avoiding double negatives
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