I thought a little about the simplest way of marking the poles so you'd always assemble them the same way, but I wanted the fewest marks as possible. I think this is it:
There is a seam on where the metal is joined down the side of the OTA, two of the trusses meet there around the seam so I simply put a texta dot right near the bottom of those 2 poles at the seam. The poles are not reversible so if you put those 2 dots at the seams there is only one way to assemble the trusses .
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