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"Fly above the Earth" by Masakazu Matsumoto, licensed under CC BY 2.0
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"Moscow metro Aviamotornaya station interior 360 193335 (22080493215)" by Artem Svetlov, licensed under CC By 2.0, compressed from the original image
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"Portugal, Ingrejina - Pink door" by muffinn, licensed under CC BY 2.0, cropped from the original image and changed the file format