randomly use one (out of 4) picture in a trial


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xizhouxie
xizhouxie
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Sorry if this question has been asked. I tried searching and I couldn't find answers.

I have 3 trials (correct, incorrect, mixed) and 4 picture sets (A,B,C,D). The picture sets each has 3 items in them. For each participant, I want the "correct" trial to use randomly 1 out of the 4 picture sets, and so on for all 3 trials. How can I do that?
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