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The issue of system response to users has been extensively studied by the natural language generation community , though rarely in the context of dialog systems .
 part of: system response, natural language generation community; compare: natural language generation community, dialog systems
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:  system response, natural language generation community; natural language generation community, dialog systems 
Answer:
 part of: system response, natural language generation community; compare: natural language generation community, dialog systems