6801
Unification is often the appropriate method for expressing relations between representations in the form of feature structures ; however , there are circumstances in which a different approach is desirable .
 used for: method, relations between representations; used for: feature structures, relations between representations; compare: approach, method
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:  method, relations between representations; feature structures, relations between representations; approach, method 
Answer:
 used for: method, relations between representations; used for: feature structures, relations between representations; compare: approach, method