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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 .
 used for: knowledge engineering, heuristic rules; used for: approach, speech knowledge; used for: mathematical tools, speech knowledge
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:  knowledge engineering, heuristic rules; approach, speech knowledge; mathematical tools, speech knowledge 
Answer:
 used for: knowledge engineering, heuristic rules; used for: approach, speech knowledge; used for: mathematical tools, speech knowledge