A grouped column chart places several columns side by side within each category, making it easy to compare a few series across the same set of groups.
Group when you want to compare the individual values against each other - this quarter versus last - rather than show how they sum to a total. Stack them when the total is the point.
A few per category stays readable; beyond that the columns get thin and hard to compare. With many series, consider a line chart or small multiples instead.
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