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This generation system also uses disjunctive feature structures to reduce the number of copies of the derivation tree .
 used for: disjunctive feature structures, generation system; used for: disjunctive feature structures, derivation tree
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:  disjunctive feature structures, generation system; disjunctive feature structures, derivation tree 
Answer:
 used for: disjunctive feature structures, generation system; used for: disjunctive feature structures, derivation tree