Australian archaeologists Damian Evans, left, and Roland Fletcher, right, study a map of Angkorian city during a tour of excavation site in Siem Reap province, Cambodia, on Wednesday Jan. 23, 2008. An international research group is now trying to dig up answers to the question about Angkorian hydraulic network as part of its quest to shed more light on the puzzles left since the demise of the Angkor city centuries ago.(AP Photo/Heng Sinith)
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