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Find a Wikipedia image that answers this question: At the Olympic Stadium in Barcelona, what shape is the green playing field?

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Represent the given Wikipedia image with related text information: Olympic Stadium Barcelona.

['<|image_1|>\nRepresent the given Wikipedia image with related text information: Piscines Montjuïc Barcelona Catalonia.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Athletics at the 2010 Summer Youth Olympics, Bishan Stadium, Singapore - 20100823-225  Athletics at the 2010 Summer Youth Olympics, held at Bishan Stadium, Singapore.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Olympic Stadium, Munich (1)  Olympic Stadium, Munich.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: 1996 Atlanta Summer Olympics cauldron 0460.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Beijing Olympics Birds Nest Roof.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Athletics at the 2010 Summer Youth Olympics, Bishan Stadium, Singapore - 20100823-174  Athletics at the 2010 Summer Youth Olympics, held at Bishan Stadium, Singapore.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Australia Stadium.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Olympic Park, London, 14 June 2011 (1) Construction of Olympic Park, London (June 2011). Aerial photo of the Olympic Park stadium (left) and media centre (right).\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Athletics at the 2010 Summer Youth Olympics, Bishan Stadium, Singapore - 20100823-159  Athletics at the 2010 Summer Youth Olympics, held at Bishan Stadium, Singapore.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Stockholms Stadion Supporterstand.\n', '<|image_1|>\nRepresent the given Wikipedia image with related text information: Berliner Olympiastadion, Gesamtansicht 2013.\n']
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