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In September 1942 , Walter Baade ruled out the " north following " star , but found the evidence inconclusive for the " south preceding " star .
 person: Walter Baade
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: Walter Baade 
Answer:
 person: Walter Baade