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The proposed algorithm is based on a statistical model of short-term log-energy sequences for echo-free speech .
 used for: statistical model of short-term log-energy sequences, algorithm; used for: statistical model of short-term log-energy sequences, echo-free speech
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
 Entity Pairs:  statistical model of short-term log-energy sequences, algorithm; statistical model of short-term log-energy sequences, echo-free speech 
Answer:
 used for: statistical model of short-term log-energy sequences, algorithm; used for: statistical model of short-term log-energy sequences, echo-free speech