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This generation system also uses disjunctive feature structures to reduce the number of copies of the derivation tree .
 disjunctive feature structures, generation system; disjunctive feature structures, derivation tree
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 disjunctive feature structures, generation system; disjunctive feature structures, derivation tree