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The Principal Riverwalk is a riverwalk park district being constructed along the banks of the Des Moines River in the downtown .
 location: Principal Riverwalk; location: Des Moines River
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Principal Riverwalk, Des Moines River 
Answer:
 location: Principal Riverwalk; location: Des Moines River