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Cubans have to queue for just about everything - you'll see lines at banks, at the phone company, bus and taxi terminals, and at shops of all kinds.

One might think that foreigners who are coming to change money and bring in desperately needed cash might have an "express" line at a bank. But no. We just join the queue.

It's not the kind of organized queue you might find in England or Germany. The protocol runs like this: you step up and ask: "¿Que es último?" (Who's the last one?) Someone will speak up or raise their hand and that's all you need to know.