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Furthermore , a problem of forming articulatory trajectories is formulated to solve labial coarticulation effects .
 forming articulatory trajectories, labial coarticulation effects
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:
 forming articulatory trajectories, labial coarticulation effects