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Vaidya 's first stint at teaching was at the Dharmendra Singhji College in Rajkot , where he joined as a lecturer in 1940 , soon after completing his M. Sc .
 Vaidya, Rajkot
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vaidya, Rajkot