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Imagine you could own one of two currencies. One currency is easy to obtain. In fact, you won’t have to do any more than live your life in the usual way — paying by credit card and eating occasional meals at restaurants — in order to fill up your account. You can exchange that currency at any time you want for a free flight or a free upgrade to a first class seat or a free stay in a hotel. Play it smart and you can travel anywhere you want in the world at any time for next to nothing.