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Pseudo-randomization of all questions

I am creating a survey with questions classified in 10 different categories. All questions need to be displayed in random order and one per page. However, questions of the same category must not appear one after the other. Between questions of the same category there should be at least 3 questions of different categories. How can I achieve this? Do I need to implement some javascript code?
Best answer by LibertyW
That... or maybe add some category counter variables to your randomizers if you don't want to work out the code.
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