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It is commonly argued that the number of comets in the Solar System is much higher than would be expected given its supposed age .
 location: Solar System
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: Solar System 
Answer:
 location: Solar System