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That reminds me of thing I heard many years ago: "And now look at Czech Post, it's obviously more reliable than internet. They can deliver letters with unbounded latency, letters could be delivered out of order, letters can get lost, but no mater what they do they are not able to deliver one letter twice"

On the other hand, after few years on various logistics-related projects, I would not be too surprised if there is some postal service or carrier that is actually able to somehow physically duplicate one shipment and deliver it twice :)

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