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Prime Minister Billy Hughes wished to amend the legislation to require conscripts to serve overseas , and held two non-binding referendums – one in 1916 and one in 1917 – in order to secure public support .
 person: Billy Hughes
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: Billy Hughes 
Answer:
 person: Billy Hughes