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Semi-Riemannian metrics are uniquely determined by the smoothing of discrete functions and the nullity of the semi-Riemannian space .
 smoothing of discrete functions, Semi-Riemannian metrics; smoothing of discrete functions, nullity of the semi-Riemannian space; nullity of the semi-Riemannian space, Semi-Riemannian metrics
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:
 smoothing of discrete functions, Semi-Riemannian metrics; smoothing of discrete functions, nullity of the semi-Riemannian space; nullity of the semi-Riemannian space, Semi-Riemannian metrics