Masked revelers wave during the celebrations to mark the start of the street carnival season during a carnival procession in downtown Lucerne, Switzerland.
(Photo by Steffen Schmidt / AP)
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A girl feeds a swan at the Black Sea coast near the town of Varna north-east of the Bulgarian capital Sofia.
(Photo by Petar Petrov / AP)
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A Chinese worker cleans near the main swimming competition pool, which reflects the roof pattern, inside National Aquatics Center, known as the Water Cube, at the Olympic Green in Beijing.
(Photo by Andy Wong / AP)
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