How to form the genitive singular of nouns
Nom sg
Gen sg
1st declension
Masc
(cons)
+а
-ь
+я
-й
+я
-ий
+ия
Neut
-о
+а
-е
+я
-ие
+ия
2nd decl
Fem
Masc
-а
+ы
-я
+и
-ия
+ии
3rd decl
Fem
-ь
+и
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