In a bivariate choropleth map, two categories of data are being displayed visually using color on a map. Below, while technically a trivariate choropleth map, is as close as I could find to the map in question without referring to a map already used in 2010 Map Blogs, so I hope you'll cut me some slack. It shows 3 different choropleths, red, blue and magenta, all overlaid together so that the colors mix. It's clever, but you have to know your cover wheel to decipher it at all.
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