<div>Hi!</div><div><br></div>For example, I want to present 4 stimuli in a block, A(1), A(2), B(1), B(2). They are presented at random, one at a time, with the constraint that for A and B, (1) is always presented before (2). That is, A(1) must be before A(2), B(1) must be before B(2). How should I do that in Eprime? <div><br></div><div>For the above case, it is possible to list all possible arrangements and choose one at random, but with more pairs of stimuli, it becomes impossible. So I wonder how that can be done in a general way.</div><div><br></div><div>Many many thanks!!!</div>
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