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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 .
 approximate variational technique, inference; approximate variational technique, learning; inference, learning
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 approximate variational technique, inference; approximate variational technique, learning; inference, learning