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We discuss maximum a posteriori estimation of continuous density hidden Markov models -LRB- CDHMM -RRB- .
 used for: maximum a posteriori estimation, continuous density hidden Markov models -LRB- CDHMM -RRB-
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
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Text: {0} 
 Entity Pairs:  maximum a posteriori estimation, continuous density hidden Markov models -LRB- CDHMM -RRB- 
Answer:
 used for: maximum a posteriori estimation, continuous density hidden Markov models -LRB- CDHMM -RRB-