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In contrast to many of the past efforts that make use of heuristic rules whose development requires intense knowledge engineering , our approach attempts to express the speech knowledge within a formal framework using well-defined mathematical tools .
 knowledge engineering, heuristic rules; approach, speech knowledge; mathematical tools, speech knowledge
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:
 knowledge engineering, heuristic rules; approach, speech knowledge; mathematical tools, speech knowledge