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We investigate the problem of fine-grained sketch-based image retrieval -LRB- SBIR -RRB- , where free-hand human sketches are used as queries to perform instance-level retrieval of images .
 used for: free-hand human sketches, instance-level retrieval of images
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: free-hand human sketches, instance-level retrieval of images