This is the most basic treemap you can do. The input dataset is simple: we just have 3 groups, and each has a value which we map to an area.
It allows to learn the syntax of the treemap library: you need to provide at least a dataset, the column that describes groups, and the column that gives the size of each group.
See graph # to learn how to add subgroups, and graph # to customize the appearance of the chart.
# Create data
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