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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 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:  algorithm, labeling curvilinear structure; line drawings, labeling curvilinear structure; line drawings, edge images; edge images, labeling curvilinear structure; CURVE-ELEMENT tokens, spatially-indexed and scale-indexed data structure 
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