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Cullen studied agricultural science at the University of Melbourne and soon turned to detailed studies of irrigation and the problems it can bring to the land it makes productive .
 person: Cullen; organization: University of Melbourne
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: Cullen, University of Melbourne 
Answer:
 person: Cullen; organization: University of Melbourne