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This paper presents an algorithm for labeling curvilinear structure at multiple scales in line drawings and edge images Symbolic CURVE-ELEMENT tokens residing in a spatially-indexed and scale-indexed data structure denote circular arcs fit to image data .
 used for: algorithm, labeling curvilinear structure; feature of: line drawings, labeling curvilinear structure; conjunction: line drawings, edge images; feature of: edge images, labeling curvilinear structure; part of: CURVE-ELEMENT tokens, spatially-indexed and scale-indexed data structure
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: algorithm, labeling curvilinear structure; feature of: line drawings, labeling curvilinear structure; conjunction: line drawings, edge images; feature of: edge images, labeling curvilinear structure; part of: CURVE-ELEMENT tokens, spatially-indexed and scale-indexed data structure