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In 1984 , a constitutional crisis arose when the outgoing " lame duck " Prime Minister Robert Muldoon refused to follow the wishes of a new incoming government led by David Lange .
 person: Robert Muldoon; person: David Lange
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Robert Muldoon, David Lange 
Answer:
 person: Robert Muldoon; person: David Lange