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During the 18th century , Senapelan region on the banks of the Siak River became a market for the Minangkabau merchants .
 location: Senapelan; location: Siak River; location: Minangkabau
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Senapelan; location: Siak River; location: Minangkabau