Designate first and second instance of a picture

[np]

I'll try to keep this short and to the point. I am creating a stimuli to 
use with EEG equipment.

In my procedure I have Image1 -> Mask -> Image 2 

Image1 calls to a set of 80 pictures in a list, while Image2 calls to a 
nested list of 40 pictures (each present 2x). I created the nested list in 
order to randomize both Image1 and Image2 for each trial. In the stimtag 
for Image 2, I want to designate whether each presentation of each picture 
is the first or second instance of that picture while keeping everything 
completely randomized. Is there a way to create an attribute that 
designates whether a picture was presented first or second? 

Let me know if more information is needed for an answer.

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