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Motivated by the success of ensemble methods in machine learning and other areas of natural language processing , we developed a multi-strategy and multi-source approach to question answering which is based on combining the results from different answering agents searching for answers in multiple corpora .
 ensemble methods, machine learning; ensemble methods, natural language processing; multi-strategy and multi-source approach, question answering
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:
 ensemble methods, machine learning; ensemble methods, natural language processing; multi-strategy and multi-source approach, question answering