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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
Once (shame on you!)
Twice (shame on me!)
More often than I'd like to be
All the time
Just when answering stupid polls
Who you callin' a fool?
I refuse to vote in this ridiculous poll
Results (534 votes). Check out past polls.