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To support engaging human users in robust , mixed-initiative speech dialogue interactions which reach beyond current capabilities in dialogue systems , the DARPA Communicator program -LSB- 1 -RSB- is funding the development of a distributed message-passing infrastructure for dialogue systems which all Communicator participants are using .
 used for: distributed message-passing infrastructure, dialogue systems
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:  distributed message-passing infrastructure, dialogue systems 
Answer:
 used for: distributed message-passing infrastructure, dialogue systems