I'm Building an Incubator - please don't bother asking permission to laugh at me

Did you try opening your eyes?
am i supposed to do that?
the rails ends are different, one side has two nubs,. one side has one nub like this

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so the sigle nub is to the right and the 2 nubs are to the left but, does the upper or lower nub go into which part
 

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