consecutive keywords in C#

I was challenged to come up with a valid example of property/method/class/namespace declaration in C# using 8 consecutive keywords in a row. So far I was able to come up with only 7.

abstract class ClassA
{
    protected internal unsafe abstract void GetNumber();
}

class ClassB : ClassA
{
    async sealed protected internal override unsafe void GetNumber() {}
}

What would be an example of using 8 or more consecutive C# keywords ?