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This visualization shows the progression of confirmed COVID-19 cases, deaths, and recoveries across multiple countries from January to March 2020. It uses a multi-line chart with time on the x-axis and case counts on the y-axis. The code loads data from three CSV files and uses d3.csv, d3.scaleLinear, d3.line, d3.axisLeft, d3.axisBottom, and d3.curveBasis to render the chart. A timer updates the displayed date range, animating the lines as new data points appear over time.