File:1. May-Demonstration of the CGTP in Porto (5676753853).jpg
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![File:1. May-Demonstration of the CGTP in Porto (5676753853).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/fb/1._May-Demonstration_of_the_CGTP_in_Porto_%285676753853%29.jpg/800px-1._May-Demonstration_of_the_CGTP_in_Porto_%285676753853%29.jpg?20130326050138)
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