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A woman visits the "Pop Art Stars" exhibition in Lisbon, Portugal, Sept. 11, 2019. The exhibition displays 122 art pieces, and runs until Jan. 5, 2020. (Photo by Pedro Fiuza/Xinhua)

A woman visits the "Pop Art Stars" exhibition in Lisbon, Portugal, Sept. 11, 2019. The exhibition displays 122 art pieces, and runs until Jan. 5, 2020. (Photo by Pedro Fiuza/Xinhua)