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Clarke was elected in 1768 , winning a contested election ( a rare event in Derbyshire ) to beat one of the sitting MPs , Sir Henry Harpur .
 Clarke, Derbyshire, Sir Henry Harpur
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Clarke, Derbyshire, Sir Henry Harpur