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enum CoreVersion
{
  DotNetCore31,
  Net5,
  Net6,
  WhatsCore,
  WhoCares
}

var you = Programmer.Factory();

if (you.AreUsing(".NET") && you.AreUsing("Core"))
{
   CoreVersion version = you.WhichDoYouUse();
   Console.WriteLine(version);
}

#pragma warning disable CS8714 // The type cannot be used as type parameter in the generic type or method. Nullability of type argument doesn't match 'notnull' constraint.
#pragma warning disable CS8602 // Dereference of a possibly null reference.
#pragma warning disable CS8600 // Converting null literal or possible null value to non-nullable type.
#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.