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Colin F Reynolds wrote:
>Don't most area maps use four colo(u)rs, that being the maximum number
>of colors required to assure that no two adjacent regions bear the same
>color?
Most area maps do use this (I'm guessing you're talking about maps in the
very literal, map-on-paper for geographical purposes sense). But this
doesn't work for his proposal. If each link corresponds to a *color*, then
there must be *one* color per link, and vice versa. Hence, there must be as
many colors as there are links.