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Design a serverless event-driven architecture for an order processing system handling 10,000 orders/minute, addressing cold starts, idempotency, error handling with DLQs, and eventual consistency.
## Problem
Design a serverless event-driven architecture for an e-commerce order processing system. The system handles the full order lifecycle: placement, payment processing, inventory update, fulfillment, and notification, using Lambda functions triggered by events.
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Design canvas, rubric, hints, and model solutions.