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+VENN.MP
+
+This package allow you to draw Venn diagrams, properly shaded, with Metapost.
+
+For example:
+
+ draw_venn_two(true,false,true,false) shifted (2in,1in);
+
+draws a diagram with the outer box shaded, with the first circle but not
+the second unshaded, with the intersection of the two shaded, and with the
+second circle but not the first unshaded. That is, this is a picture of
+the complement of the symmetric difference of A and B.
+
+There are commands also for draw_venn_three and for completeness
+draw_venn_one and draw_venn_none (go ahead and laugh; see if I care).
+
+The license is the LaTeX Project Public License.
+
+Jim Hefferon