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Magnetic agitator This is a device formed by a metallic bar ( called the agitation bar ) which is normally covered by a plastic layer , and a sheet that has underneath it a rotatory magnet or a series of electromagnet s arranged in a circular form to create a magnetic rotatory field .
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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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