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I am creating a Stroop Task and would like to balance the presentation of stimuli such that there are equal number of congruent and incongruent trials. Additionally, I'd like to be able to display each of the four colors an equal number of times and randomly order the presentation so that combinations which have been presented previously will have a lower probability of being presented again. In lieu of this, is there any way to prevent identical stimuli from being presented consecutively? Any assistance would be greatly appreciated.
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