Matching Exercises with images

I'm using images in matching exercises (little bullet). The properties set to the text(choices) to publish is "Render text as image for HTML publishing", because I want the matching columns work only with the bullets. It works fine. The problem is: how to reset/clear the exercise to allow my students to redo the same exercise as many times as they want? Is there any possibility to do it? I'm publish only to HTML.Thanks,Luciana

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