I'm putting together an experiment in which I have 7 different exposure durations for the stimuli.  I want to randomize both the order of presentation of the different exposure durations (with replacement, for a total of 10 exposures at each) and the assignment of stimuli to exposure duration conditions (each stimulus occurring only once, but potentially in a different exposure duration each time the experiment runs).  The only other catch is that each stimulus is paired with a particular item for a decision (do the words match or not), and these pairs need to be maintained (i.e., selecting a particular stimulus means its pair word must always be the same).  I'm trying to do this through nested lists, and have successfully randomized the order of exposure durations, but am stumped on how to randomize targets to the different conditions.  It seems like it shouldn't be that hard, and maybe I'm just being dense, but I can't figure it out.  Anyone have any ideas?

Thanks!

JoAnn.

JoAnn.