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The class structures of original samples can be characterized and deformed by local metrics of the semi-Riemannian space .
 used for: local metrics of the semi-Riemannian space, class structures
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:  local metrics of the semi-Riemannian space, class structures 
Answer:
 used for: local metrics of the semi-Riemannian space, class structures