The silhouette of Tim Cook, chief executive officer of Apple Inc., is seen as he exits the stage during the Apple World Wide Developers Conference (WWDC) in San Francisco, California, U.S., on Monday, June 8, 2015. Apple Inc. kicked off its annual developers conference in San Francisco, where the company will unveil a revamped streaming-music service, improvements to its mobile software and tools to speed up smartwatch applications. Photographer: David Paul Morris/Bloomberg via Getty Images
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