True/False revealing a Next Button not right

Hi all - new user here.  I have a project where I'm not activating the "next" button until the learners have visited all 4 layers presented. Each layer has an OK button with a true false variable, but my next button only works correctly if you visit the four layers in order from top to bottom.  If someone clicks those 4 out of sequential order, that's ok.  Can anyone help?

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