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SUBMIT YOUR IDEAHere is my solution and it was difficult to me.
Here is my solution.
I had assumed that one delivery is made per item (per store) and that not every item is delivered separately. My solution multiplied by the "Assigned" items, now results in the solution.
Revisited this one as I'm working through all the challenges.
In this one - I redid the solution from 2017 and the answer is much cleaner - see in the spoiler below