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In this paper , we explore geometric structures of 3D lines in ray space for improving light field triangulation and stereo matching .
 used for: geometric structures of 3D lines, light field triangulation; used for: geometric structures of 3D lines, stereo matching; feature of: ray space, geometric structures of 3D lines; conjunction: light field triangulation, stereo matching
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: geometric structures of 3D lines, light field triangulation; used for: geometric structures of 3D lines, stereo matching; feature of: ray space, geometric structures of 3D lines; conjunction: light field triangulation, stereo matching