3831
A model is presented to characterize the class of languages obtained by adding reduplication to context-free languages .
 model, class of languages; reduplication, context-free languages
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:
 model, class of languages; reduplication, context-free languages