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This example draws a smiling face using SVG primitives and animates its eyebrows. It uses D3 v7’s `select` and `arc` APIs, along with the `transition` method to move the eyebrows down and back up over two seconds. The face’s head, eyes, and mouth are constructed with circles, rectangles, and an arc path, all positioned via SVG transforms. The rendering is a static SVG with a single animated group, demonstrating basic D3 shape creation and chained transitions.