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Generating a random grid of images

I'm new to Opensesame (and programming in general) and I'm trying to create a grid of 100 images; 1 target image and 99 distractor images. I have all my stimuli generated (4 possible targets and 8 possible distractors) and in the file pool. I need to generate a random grid selecting 1 target item randomly and using the 8 distractors to fill in the 99 other positions. The target can be in any location on the grid. What is the best way to do this? Do I need to make a sample grid in the sketchpad and then randomize that? I honestly have no idea where to start...

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