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In such cases dimensionality reduction can be employed to find a low-dimensional representation on which classification can be done more efficiently .
 dimensionality reduction, low-dimensional representation; low-dimensional representation, classification
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 dimensionality reduction, low-dimensional representation; low-dimensional representation, classification