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Repeat this procedure to dd add another context to add a folder containing the output parameters. If the "Output Parameters" context shows up underneath "Input Parameters" as a nested context rather than the separate context it is meant to be, it means that "Input Parameters" was selected as the parent, and any items added will be children underneath it in the hierarchy. To resolve this issue, one needs to select the incorrect item, and then use Edit Definition → Remove to remove the item from the hierarchy.
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