> rectangles are never squares If squares can be rectangles, rectangles can be squares, by virtue of happening to be a square that is also a rectangle. However

> rectangles are never squares If squares can be rectangles, rectangles can be squares, by virtue of happening to be a square that is also a rectangle. However not all rectangles are squares. I suppose I get the point you're trying to make, but the bar of exactly what makes something a kink or not is something I don't really understand.