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Fill colors with two contour plots

Assume I have two contour plots, of functions A and B, say, depending on x and y, with one level curve on each plot. There are two different zones in each plot, filled with two colors, like in the following:

Gr += contour_plot(A,(x,0,10),(y,0,10),contours=1,cmap=['white', 'red']);
Gr += contour_plot(B,(x,0,10),(y,0,10),contours=1,cmap=['yellow', 'blue']);

The problem is that the resulting picture only shows the filling colors of the second plot.

How do I get a picture with each zone (from both plots) in a different color ? some kind of transparency ?

Sorry if my question is trivial,

Thanks !