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A grid of thirty smiley faces renders in SVG via React, each with randomized eye offset and radius, mouth radius, and fixed stroke width, showcasing composable D3 arc paths for the mouth within a reusable Face component. The example uses React 16, D3 6, and ReactDOM, with faces drawn from D3's `range` and `arc` APIs, demonstrating layered SVG circle and path primitives in a functional component hierarchy.