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The legalized abortion and crime effect popularized by " Freakonomics " coauthor Steven Levitt posits that the drop in violent crime is due to fewer children being born to parents who were unwilling or unable to care for them .
 Freakonomics, Steven Levitt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Freakonomics, Steven Levitt