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One main difference in the mother and daughter 's writings is that Carol 's books contain a slight sense of humor that her mother 's , Mary Higgins Clark do not possess .
 Carol, Higgins Clark
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Carol, Higgins Clark