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In our framework , the structures of classes are conceptualized as a semi-Riemannian manifold which is considered as a submanifold embedded in an ambient semi-Riemannian space .
 semi-Riemannian manifold, structures of classes; submanifold, ambient semi-Riemannian space
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:
 semi-Riemannian manifold, structures of classes; submanifold, ambient semi-Riemannian space