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To address the sentence retrieval problem , we apply a stochastic , graph-based method for comparing the relative importance of the textual units , which was previously used successfully for generic summarization .
 used for: stochastic , graph-based method, sentence retrieval problem; used for: stochastic , graph-based method, generic summarization
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:  stochastic , graph-based method, sentence retrieval problem; stochastic , graph-based method, generic summarization 
Answer:
 used for: stochastic , graph-based method, sentence retrieval problem; used for: stochastic , graph-based method, generic summarization