I'm writing an app that will allow me to pick an assortment of index cards for printing. The cards are naturally grouped a number of different ways, and I've had no problem figuring out how to display and filter them by those groups (e.g. action, treasure, etc.). The trick, however, is that the user needs to be able to pick specific cards (or all, or whatever) and review those picks, before the app generates the PDF with the desired selection. I have no idea how I should even approach the problem, outside of thinking "shopping cart". Would anyone care to offer a suggestion?
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