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As a composer he has written a cantata , Vision of Peace to texts from the Book of Isaiah , and several art songs to the poetry of Pauline Johnson and Robert Browning .
 Pauline Johnson, Robert Browning
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pauline Johnson, Robert Browning