Value Sort Activity

I'm trying to create a value sort activity in Storyline. The first slide in the presentation will display 15 values (e.g. family, money, health). The learner will be instructed to select 7 values and then click Submit. After submitting, they move to the next slide in the presentation. The 7 values they selected are listed on the slide and they are then instructed to select 3 values out of the 7.

Any advice on how to approach building this interaction? I'm having trouble:

1. Ensuring they don't submit more than or less than 7 values.

2. Ensuring that the variables update correctly if they change their mind and unselect a value so they can select a different one.

Has anyone successfully created something similar?

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