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Our proposed approach builds on recent advances in spectral clustering , image matting , and boundary detection .
 used for: spectral clustering, approach; conjunction: spectral clustering, image matting; used for: image matting, approach; conjunction: image matting, boundary detection; used for: boundary detection, approach
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: spectral clustering, approach; conjunction: spectral clustering, image matting; used for: image matting, approach; conjunction: image matting, boundary detection; used for: boundary detection, approach