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This one here, all right, we'll do this one. I was thinking of whether to do this one or not, and the fifth one here just to have it as a quiz question. But I think we'll, all right, number four and then number five, I'll do as a quiz question as well. Because I think you'll find this one interesting. If a star doesn't have enough, quite enough mass to collapse into a black hole, what is the product? So what's the product? If it doesn't have enough mass to collapse into a black hole, so what's one stage up from a black hole?