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A legend or key
It's just mean code. Because the use word key when somaone need open something and if you do not have key or code, that mean you can open it. For example: your password, your ID,....
key factor
sex
the key or legend, that is the technical term, tells you what each symbol on the map represents. the symbols can mean different things so check the key or legend for help knowing what the symbols mean.
x-ray
The legend or key shows what the symbols mean
U use if the states or continents are colored so the legend tells you what the colors mean that's why the legend is important
Check the Legend or Key if it has it.
When some one has sex with one another
When some one has sex with one another
The Key or Legend is the little table that tells you what the symbols all mean. Phil