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![OC][Diagram] Many of you asked me to do the Metro do Porto, so here it is : r/portugal](https://preview.redd.it/z9ni7nmzqcy41.png?auto=webp&s=ec2cba51026050855df972072441a0f578e679ac "OC][Diagram] Many of you asked me to do the Metro do Porto, so here it is : r/portugal")