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Together with Robert B. Leighton , he completed the Two-Micron Sky Survey , the first infrared survey of the sky , which cataloged more than 5,000 infrared sources .
 person: Robert B. Leighton
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: Robert B. Leighton 
Answer:
 person: Robert B. Leighton