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We first apply approaches that have been proposed for predicting top-level topic shifts to the problem of identifying subtopic boundaries .
 used for: approaches, predicting top-level topic shifts; used for: approaches, identifying subtopic boundaries; feature of: predicting top-level topic shifts, identifying subtopic boundaries
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: approaches, predicting top-level topic shifts; used for: approaches, identifying subtopic boundaries; feature of: predicting top-level topic shifts, identifying subtopic boundaries