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Although hidden Markov models -LRB- HMMs -RRB- provide a suitable generative model for field structured text , general unsupervised HMM learning fails to learn useful structure in either of our domains .
 used for: hidden Markov models -LRB- HMMs -RRB-, generative model; used for: generative model, field structured text
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 used for: hidden Markov models -LRB- HMMs -RRB-, generative model; used for: generative model, field structured text