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What is the longest river in Europe?
What is the biggest city in Switzerland?
What is the largest island in the Mediterranean sea?
What is the official language of Andorra?
In which country is Lake Balaton located?
Which country is smaller than the others?
In which country is the city Tartu located?
Which country's name means "Black mountain"?
Which sea borders nine countries?
Which city is the second largest in its country?