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int? a = null;
int b = a??5;
Console.WriteLine(b);
int? a = 1;
int b = a??5;
Console.WriteLine(b);
int? a = null;
int b = a??5;
Console.WriteLine(b);
int? a = 1;
int b = a??5;
Console.WriteLine(b);
b = a == null ? 5 : a;
if (a == null)
b = 5;
else b = a;