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Noise reduction , the recovery of the original signal from the noise-corrupted one , is a very common goal in the design of signal processing systems , especially filter s. The mathematical limits for noise removal are set by information theory , namely the Shannon-Nyquist theorem .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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