I am creating a monthly survey that has a brand list that that contains a minimum of 1 brand to a max of 10. The brands a respondent will see depends on a whether they shopped there in the past (Q1). In this example, pretend that the respondent shopped at Brands A, B, C, D and E.I have a loop and merge where I present a max of 3 brands to the respondent. The only exception would be is that the respondent could not see both Brands A and C. We are allowing all other combinations as long as Brands A and C are not together. Is this possible? Keep in mind that the brand list changes every month and that the brands that cannot be together are also changing. Thanks in advance.

Hi @rarcegaIt’s not clear to me if the max number of brands in the L&M is 3 or 10, but here’s how I would go about this:Add a hidden/autopunch (with custom js) selection question after your brands selection question using carry forward choices and choices randomization on the subset you want to exclude.Qualtrics.SurveyEngine.addOnReady(function () { this.getQuestionContainer().style.display = "none"; this.hidePreviousButton(); this.hideNextButton(); this.clickNextButton();});Use that hidden question displayed choices as the base for your L&M, randomizing the order and the presenting the number of loops you want.You can add brands monthly and hide the ones you don’t want to show anymore in your initial brands selection question, as well as change the subset for exclusion.

Step #1 doesn’t directly prevent the restricted pair (like A & C) — that part happens in Step #2.Step #1 is simply about setting up a place to store the final brand choices. You’ll create three Embedded Data fields in your Survey Flow — let’s say: • Brand1 • Brand2 • Brand3These will eventually hold the three randomly selected brands, excluding combinations like A & C. Think of these fields as placeholders for the filtered, valid selection.In Step #2, the JavaScript will: • Pull in all eligible brands from Q1 • Randomly generate combinations of 3 brands • Skip over any set that contains restricted pairs (like A & C) • Once a valid combination is found, it writes those brands into the Embedded Data fields (Brand1, Brand2, Brand3)Then, in your Loop & Merge, instead of looping over the full brand list, you loop over these three embedded data values. That’s what enforces the logic.I hope that clarifies.

Randomly picking from a list of brands but excluding certain combinations

Randomly picking from a list of brands but excluding certain combinations | Experience Community

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