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In 1850 , when he was 15 , Moore started employment in the surveyor-general 's office , remaining for four years there before moving to the North-West to work on a Hamersley & Co. station near Irwin River , where he went on to become the station manager .
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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:  
Answer:
 None