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It was during the 30 's that Boss also became acquainted with Ludwig Binswanger , who introduced Boss to the works of philosopher Martin Heidegger .
 person: Boss; person: Ludwig Binswanger; person: Boss; person: Martin Heidegger
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: Boss, Ludwig Binswanger, Boss, Martin Heidegger 
Answer:
 person: Boss; person: Ludwig Binswanger; person: Boss; person: Martin Heidegger