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Dictionary construction , one of the most difficult tasks in developing a machine translation system , is expensive .
 Dictionary construction, machine translation system
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:
 Dictionary construction, machine translation system