I've been looking around to learn about histograms, and haven't had any
luck... can someone tell me how a histogram would work for something
like this:

Name, Age
Bob, 2
Jim, 2
Eric, 4
Rob, 5

How would I use a histogram to get a result like this:

Age | Names
2   | Bob, Jim
4   | Eric
5   | Rob

Thanks in advance!!!
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