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This example demonstrates a simple animated visualization of fifteen circles moving horizontally across an SVG canvas. Each circle’s vertical position follows a sine wave, creating a wavy pattern that updates every second. The code imports `select` and `range` from D3 v5, builds the SVG with `select('body').append('svg')`, and uses `setInterval` with the `.join('circle')` operation to update the circle positions. The data for each frame is generated on the fly with `range(15).map(...)`, and `console.log` outputs the sine value. The rendering is SVG-based with no external data source.