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His ex-wife , Cathy Hearn , and his ex-brother-in-law , David Hearn , also competed in canoe slalom for the United States .
 Cathy Hearn, David Hearn, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cathy Hearn, David Hearn, United States