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Sets the keys for the legend. The elements of @legend_keys corresp
+ond to the data sets as provided to plot().
If a key is undef or an empty string, the legend entry will be ski
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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