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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
1. Keep it simple
2. Just remember to pull out 3 in the morning
3. A good puzzle will wake me up
Many. I like to torture myself
0. Socks just get in the way
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