0bd52f8bd1
and change all the challenges to new `md` format. |
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|---|---|---|
| .. | ||
| visualize-data-with-a-bar-chart.md | ||
| visualize-data-with-a-choropleth-map.md | ||
| visualize-data-with-a-heat-map.md | ||
| visualize-data-with-a-scatterplot-graph.md | ||
| visualize-data-with-a-treemap-diagram.md | ||