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Constraints provided by observed pixel colors , highlight color analysis and illumination color uniformity are employed in our method to improve estimation of the underlying diffuse color .
 used for: Constraints, method; conjunction: pixel colors, highlight color analysis; conjunction: highlight color analysis, illumination color uniformity; used for: method, estimation of the underlying diffuse color
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:  Constraints, method; pixel colors, highlight color analysis; highlight color analysis, illumination color uniformity; method, estimation of the underlying diffuse color 
Answer:
 used for: Constraints, method; conjunction: pixel colors, highlight color analysis; conjunction: highlight color analysis, illumination color uniformity; used for: method, estimation of the underlying diffuse color