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The cemetery was laid out in 1898 ; the buildings , by the architect Hans Grässel , were completed in 1902 .
 person: Hans Grässel
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: Hans Grässel 
Answer:
 person: Hans Grässel