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Although non-linear extensions of active shape models have been proposed and application specific solutions have been used , they still need a certain amount of user interaction during model building .
 used for: user interaction, non-linear extensions of active shape models
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:  user interaction, non-linear extensions of active shape models 
Answer:
 used for: user interaction, non-linear extensions of active shape models