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using System; class C<T> { } class A { public static void Main () { M1 ((int[][] arg) => { }); M2 ((C<short>[] arg) => { }); M3 ((C<short[]>[] arg) => { }); } static void M1<T> (Action<T[][]> arg) { } static void M2<T> (Action<C<T>[]> arg) { } static void M3<T> (Action<C<T[]>[]> arg) { } }