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It was discovered recently , that exploiting the sparsity of sources in an appropriate representation according to some signal dictionary , dramatically improves the quality of separation .
 signal dictionary, sparsity of sources; quality of separation, sparsity of sources
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:
 signal dictionary, sparsity of sources; quality of separation, sparsity of sources