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Design a simple pastebin-style service where users can paste text and get back a shareable short link to view it later.
Design a basic file upload service that lets users upload images up to 10MB and later retrieve them by a shareable link.
Design a simple 'who's online' presence indicator for a chat app, showing which users are currently active.
Design a simple appointment booking system for a single small clinic that needs to prevent two patients from ever double-booking the same time slot.
Design a system for tracking inventory counts across multiple warehouses, where the count must stay accurate even with many simultaneous sales.
Design a comments system for a blog that needs to support threaded replies (comments on comments) and display them efficiently, even with thousands of comments on one post.
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