Sequential displaying of non-blank textboxes

Hi!

So, I have a problem/challenge:
I have 5 text entry boxes.
Either combination of text entry boxes can be filled in by the user.
I then have a slide/layer that is should only show the boxes that were filled in BUT sequentially (without creating a gap in the middle when boxes in-between where not filled in).

 I've started with variables, but I'm wondering if that is the best way to do this, seeing all to possible combinations.
I've attached a demo file so you can see what I mean, incase it's not clear (NOTE: it's not yet fully functioning but text box 1 and (maybe?) textbox 2 should work.)