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Bradley McGogg , the Very Fine Frog is a book by Canadian children 's book author Tim Beiser , illustrated by Canadian painter Rachel Berman .
 Canadian, Tim Beiser, Canadian, Rachel Berman
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Canadian, Tim Beiser, Canadian, Rachel Berman