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Around the turn of the 4th century , as Memphis was continuing to decline in importance , the Romans established a fortress town along the east bank of the Nile .
 location: Memphis; location: Nile
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: Memphis, Nile 
Answer:
 location: Memphis; location: Nile