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BARCELONA, SPAIN - SEPTEMBER 28:  Students get caught in an air vent as they gather to demonstrate against the position of the Spanish government to ban the self-determination referendum of Catalonia during a strike by university students on September 28, 2017 in Barcelona, Spain. The Catalan government is keeping with its plan to hold a referendum, due to take place on October 1, which has been deemed illegal by the Spanish government in Madrid.  (Photo by Dan Kitwood/Getty Images)
BARCELONA, SPAIN - SEPTEMBER 28:  Students get caught in an air vent as they gather to demonstrate against the position of the Spanish government to ban the self-determination referendum of Catalonia during a strike by university students on September 28, 2017 in Barcelona, Spain. The Catalan government is keeping with its plan to hold a referendum, due to take place on October 1, which has been deemed illegal by the Spanish government in Madrid.  (Photo by Dan Kitwood/Getty Images)

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    Catalonia: What you need to know

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Catalonia: What you need to know

It has its own flag, its own national anthem and its own language. But many Catalans want more: They want to be independent.

Catalonia: What you need to know

It has its own flag, its own national anthem and its own language. But many Catalans want more: They want to be independent.