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In the early 1950 s , workers at DuPont conclusively demonstrated that short and long branching in polyethylene was due to two different mechanisms of chain transfer to polymer .
 organization: DuPont
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: DuPont