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While the model is more complex than those which have been employed for unsupervised learning of POS tags in English , which use only syntactic information , the variety of languages in the world requires that we consider morphology as well .
 model, those; those, unsupervised learning of POS tags in English; syntactic information, those
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, those; those, unsupervised learning of POS tags in English; syntactic information, those