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Coss concept prohibitions

Hi,

Brian kindly pointed out that I might be able to solve an issue in creating a binary choice task where one alternative (car) can be held constant by specifying that none of the other alternative concepts (train, bus, tram) can ever appear with each other, essentially forcing car to always be shown. This seems to be the way to go using an alt specific design... but I don't know how to structure the prohibitions. I can't prohibit the primary attributes from appearing with each other... is there a way to do this?   

Anyone have any thoughts on this?
asked Nov 1 by Jasha Bowe Bronze (1,680 points)
retagged Nov 1 by Walter Williams

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