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The image below represents the parts of your evolving architecture relevant to this exercise.
What you built
New object set of filtered flight alerts as input to your pie chart widget.
A pie chart widget grouped by flight alert Priority.
A filter variable output by your pie chart to use downstream.
What you learned
Unsurprisingly, chart widgets require input object sets, but they can also be configured to generate output variables that can be used to filter downstream object sets.