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The second phase of the Challenges beta has begun, so it's time for you to help find our first winners. The beta is going well, with a large number of excellent photos being submitted and a small number of bugs, quirks and missing features being identified. But to really understand how votes are going to work, we need a lot more of them. So we invite you to take a moment to look at the challenges, vote for the images you like and help both to improve the system and select some worthy winners.

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