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The balancing is highly essential , especially in high speed applications such as electric motors , generators , turbines , pumps , air crafts etc Unbalanced system In any system having one or more rotating masses , if the centre of mass of the system ( C. G ) doest not lie on the axis of rotation , then the system is called unbalanced system .
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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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