How to randomize the trial order under constraints

[Johanna Xi]

Hi!

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? 

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.

Many many thanks!!!

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