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He was dispatched in 1891 to Zanzibar , recently exchanged with Heligoland , and worked with Gerald Portal ( the colonial commissioner ) to promote " the first beginnings of European civilisation in the East of Africa " .
 Zanzibar, Gerald Portal
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Zanzibar, Gerald Portal