I have 20 different versions of the first question question. Remaining part of the study remains the same. A subject has to be given only 1 version of the first question and the remaining questions are the same for all participants.

1 option I have is to create 20 different input files (one with a different version for Q1) and append the remaining common questions.

Other option is having a single input file and to find a way to randomize the 20 versions within group (displaying only one of them) and then displaying the common questions.

How can I accomplish this? Any thoughts/ ideas will be appreciated.

Thank you.

Monil C