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Relatives of Chinese passengers on board the Malaysia Airlines Flight 370 pray at a hotel conference room in Beijing, China, Friday, April 18, 2014. A robotic submarine headed back down into the depths of the Indian Ocean on Friday to scour the seafloor for any trace of the missing Malaysian jet one month after the search began off Australia's west coast, as data from the sub's previous missions turned up no evidence of the plane.(AP Photo/Ng Han Guan)
Relatives of Chinese passengers on board the Malaysia Airlines Flight 370 pray at a hotel conference room in Beijing, China, Friday, April 18, 2014. A robotic submarine headed back down into the depths of the Indian Ocean on Friday to scour the seafloor for any trace of the missing Malaysian jet one month after the search began off Australia's west coast, as data from the sub's previous missions turned up no evidence of the plane.(AP Photo/Ng Han Guan)

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