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Although the system performs well within a limited textual domain , further research is needed to make it effective for open-domain question answering and text summarisation .
 textual domain, system; textual domain, open-domain question answering; it, open-domain question answering; it, text summarisation; open-domain question answering, text summarisation
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:
 textual domain, system; textual domain, open-domain question answering; it, open-domain question answering; it, text summarisation; open-domain question answering, text summarisation