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Tathams merged with Stephenson Harwood - as the firm was by then known - in 1920 to form Stephenson Harwood & Tatham , shortening its name back to Stephenson Harwood in 1977 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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