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In the 2nd century , the Romans ventured onto the right bank of the Rhine and constructed a fortress at Niederlahnstein .
 location: Rhine; location: Niederlahnstein
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: Rhine, Niederlahnstein 
Answer:
 location: Rhine; location: Niederlahnstein