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While such decoding is an essential underpinning , much recent work suggests that natural language interfaces will never appear cooperative or graceful unless they also incorporate numerous non-literal aspects of communication , such as robust communication procedures .
 non-literal aspects of communication, they; robust communication procedures, non-literal aspects of communication
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:
 non-literal aspects of communication, they; robust communication procedures, non-literal aspects of communication