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His first hymnal collections were : Some of his hymns include : Some of hymn music with lyrics by others include : The lyrics to When the Saints are Marching In are by Katharine Purvis .
 Katharine Purvis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Katharine Purvis