How to form the instrumental plural of nouns

Nom sg Ins pl
1st declension Masc (cons) +ами
+ями
+ями
-ий +иями
Neut +ами
+ями
-ие +иями
2nd decl Fem
Masc
+ами
+ями
-ия +иями
3rd decl Fem +ями

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