Question: In a context diagram, Maintainer is typically an external entity, providing both activities ( i . e . , maintenance ) and materials ( e

In a context diagram, "Maintainer" is typically an external entity, providing both activities (i.e., "maintenance") and materials (e.g., spare parts) to the system, and the system providing diagnostic data to the maintainer.
Give two examples of real-world systems where this would be the case (maintainer action and system diagnostic data back to the maintainer).

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