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A second model then attempts to improve upon this initial ranking , using additional features of the tree as evidence .
 used for: model, ranking; used for: features, model
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:  model, ranking; features, model 
Answer:
 used for: model, ranking; used for: features, model