2 buttons, only 1 required to move to next slide (Storyline 1)

Hi.  I have 2 buttons on a slide (Storyline 1) and the learner cannot move to the next slide unless they click on one of the buttons.  I know how to make my next button hidden until the required button is clicked, but how do you make either button the requirement.  In other words, they can move on if they click on either button (both are not required).  Attached is a screen shot of my variable.  Thanks.

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