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Whereas some essayists used essays for strident political themes , Robert Louis Stevenson and Willa Cather wrote lighter essays .
 person: Robert Louis Stevenson; person: Willa Cather
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: Robert Louis Stevenson; person: Willa Cather