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We focus on one speed-up element in the design of unification algorithms : avoidance of copying of unmodified subgraphs .
 speed-up element, unification algorithms
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:
 speed-up element, unification algorithms