nullable generic structure

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            int? i = 0;
            Console.WriteLine(
"i={0}", i);
            i 
= null;
            Console.WriteLine(
"i={0}", i);
            System.Nullable
<int> j = 0;
            Console.WriteLine(
"j={0}", j);
            j 
= null;
            Console.WriteLine(
"j={0}", j);
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