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We identified two tasks : First , how linguistic concepts are acquired from training examples and organized in a hierarchy ; this task was discussed in previous papers -LSB- Zernik87 -RSB- .
 linguistic concepts, hierarchy
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:
 linguistic concepts, hierarchy