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At a souvenir shop, John buys a couple of postcards. Judging from those, the lighthouse must have been modified quite a bit over the years. Which postcard shows the current version of the beacon?

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Interesting fact:

Although modern GPS technology is driving them more and more into obscurity, the coasts of the Earth are still peppered with lighthouses. Modern lanterns produce light so bright that it can still be seen from up to 50 kilometres away!