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Three dynamic lines animate columns y1, y2, and y3 from `example2.csv` as a streaming line chart. The D3 v7 script uses `d3.csv` to load data, `d3.scaleLinear` for axes, and `d3.line` generators to draw each series with distinct stroke colors. A `setTimeout` chain progressively reveals data slices, updating the `d3.axisBottom` and `d3.axisLeft` scales and SVG path attributes per step.