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This example demonstrates animated, semi-transparent circles overlaid on a lime-green background, with blue squares arranged across the top. Using D3.js’s `select`, `transition`, and `join` APIs, circles enter with staggered delays, update their position, size, and color, and can exit by shrinking. The data comes from a CSV file with fields `id`, `x`, `y`, `r`, and `fill`. The code also imports CSS to apply a multiply blend mode to the circles.