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This article introduces a bidirectional grammar generation system called feature structure-directed generation , developed for a dialogue translation system .
 used for: bidirectional grammar generation system, dialogue translation system; hyponym of: feature structure-directed generation, bidirectional grammar generation system; used for: feature structure-directed generation, dialogue translation system
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:  bidirectional grammar generation system, dialogue translation system; feature structure-directed generation, bidirectional grammar generation system; feature structure-directed generation, dialogue translation system 
Answer:
 used for: bidirectional grammar generation system, dialogue translation system; hyponym of: feature structure-directed generation, bidirectional grammar generation system; used for: feature structure-directed generation, dialogue translation system