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The mapping between the data and the hidden space is nonlinear , so we use an approximate variational technique for inference and learning .
 used for: approximate variational technique, inference; used for: approximate variational technique, learning; conjunction: inference, learning
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:  approximate variational technique, inference; approximate variational technique, learning; inference, learning 
Answer:
 used for: approximate variational technique, inference; used for: approximate variational technique, learning; conjunction: inference, learning