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William Ewart Gladstone served as prime minister four times ( 1868 – 74 , 1880 – 85 , 1886 , and 1892 – 94 ) .
 person: William Ewart Gladstone
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: William Ewart Gladstone