[rules-users] Planner with a list of planning variables

[Justin Case]

Hello all,
can I use as planning variable a list of values? 
Here's a test use case: planning a food recipe, where the recipe can have say maximally 5 ingredients (taken from the solution property, I guess). So far I could find in the examples and documentation, it's all about ONE planning variable in the solution, but here I'd need a LIST of such... is it actually doable this way? 
I cannot do it the other way around, as an ingredient may be found in more recipes...

Many thanks,
JC
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