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This paper presents a simple way to incorporate word duration constraints by unrolling HMMs to form a lattice where word duration probabilities can be applied directly to state transitions .
 used for: unrolling HMMs, word duration constraints; used for: unrolling HMMs, lattice; used for: word duration probabilities, state transitions
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
 Entity Pairs:  unrolling HMMs, word duration constraints; unrolling HMMs, lattice; word duration probabilities, state transitions 
Answer:
 used for: unrolling HMMs, word duration constraints; used for: unrolling HMMs, lattice; used for: word duration probabilities, state transitions