Thailand's Princess Sirivannavari Nariratana waves to crowd as she cycles in the “Bike for Dad” event in Bangkok, Thailand, December 11, 2015. Thai Crown Prince Maha Vajiralongkorn led thousand of cyclists on a 29-km course in Bangkok to celebrate King Bhumibol Adulyadej's 88th birthday which fell on December 5. (Photo by Chaiwat Subprasom/Reuters)
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