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Further sampling was carried out in the late 1990s for the recovery of archaeobotanical evidence and new high precision radiocarbon dates Findings The excavations at Hallur by Nagaraja Rao revealed two periods of occupation , Period I : Neolithic - Chalcolithic and Period II : An overlapping period between Neolithic-Chalcolithic and early Iron Age .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
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