The elements of such a plane (and the distance relations between them) can also be represented mathematically, namely as a 2-manifold.
... 44, 19.7% from 45 to 64, and 8.0% who are 65 years of age or older. The median age is 29 years. For every 100 females there are 107.7 males. For every 100 females age ...
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