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Like his contemporaries , Thomas Arnold ( 1742-1816 ) , Thomas Sutton ( 1767-1835 ) , and John Haslam ( 1764-1844 ) , he wrote a book on the subject titled Observations on Maniacal Disorders ( 1792 ) .
 Thomas Arnold, John Haslam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Thomas Arnold, John Haslam