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This paper included the landmark O2-CO2 diagram , which formed basis for much of Rahn 's future work .
 person: Rahn
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: Rahn 
Answer:
 person: Rahn