Resetting an action from Video Try Mode

I have embedded a Try Mode Video to a lesson plan.  At the end of the lesson I want the students to have the ability to click the previous button and return to the beginning if more practice is needed.  There are 2 screens where the students actually type in text and the Text Entry Trigger states (SetVariable2 equal to the type value when the control loses focus).  When the student returns to these screens, the typed text is still filled in from the first try.  How can I reset these slides so the typed information will be reset to "blank" when the student returns.

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