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At last, John has reached the city limits! He asks a local citizen for the best way to the city centre. Do you know the profession of the helpful resident?

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Interesting fact:

The planet is becoming more and more crowded. There are roughly 3,000 cities with a population of more than 150,000, another 1,000 with at least half a million residents, and 457 cities with a population of more than a million!