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Around year 960 , the Brethren of Purity of Basra were engaged in their " Encyclopedia of the Brethren of Purity " .
 organization: Brethren of Purity; location: Basra
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: Brethren of Purity, Basra 
Answer:
 organization: Brethren of Purity; location: Basra