1845
PURPOSE : To evaluate the effect of adding a pulsating bristle action to the established oscillating / rotating action of the Braun Oral - B Ultra Plaque Remover ( D9 ) on plaque removal .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None