7024
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 .
 used for: signal dictionary, sparsity of sources; evaluate for: quality of separation, sparsity of sources
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 used for: signal dictionary, sparsity of sources; evaluate for: quality of separation, sparsity of sources