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Michiel,

Many thanks for your reply. You properly diagnosed the problem. I'll rethink my design to see if I can avoid having two different pairs of unlabeled alternatives.

Thanks again.

I have run the following design and the output looks good, except I am getting some duplicates. Specifically, all attribute levels for alternatives 2 and 3 (or 4 and 5) are identical in some rows. I do not think this should be happening. Can someone please advise? (I only show the code for the first ...