23631
He began associating with other contemporary photographers such as Robert Frank and Diane Arbus and helped form what Jane Livingston has termed the New York School of photographers during the 1940s and 1950s .
 person: Robert Frank; person: Diane Arbus
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 Frank, Diane Arbus 
Answer:
 person: Robert Frank; person: Diane Arbus