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The prior is given by a kernel density estimate on the space of joint intensity distributions computed from a representative set of pre-registered image pairs .
 used for: kernel density estimate, prior; used for: kernel density estimate, joint intensity distributions; used for: pre-registered image pairs, joint intensity distributions
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:  kernel density estimate, prior; kernel density estimate, joint intensity distributions; pre-registered image pairs, joint intensity distributions 
Answer:
 used for: kernel density estimate, prior; used for: kernel density estimate, joint intensity distributions; used for: pre-registered image pairs, joint intensity distributions