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When he was an adolescent , Mochtar Lubis often trekked into the jungles of Sumatra .
 Mochtar Lubis, Sumatra
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mochtar Lubis, Sumatra