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+% --- start of displayed preamble in the book ---
+input piechartmp;
+% --- end of displayed preamble in the book ---
+% graphic converted to gray in book using 'color2gray'
+defaultfont:="ptmr8r";
+warningcheck:=0;
+beginfig(1)
+Segment(15,"Lions",auto);
+Segment(6,"Tigers",auto);
+Segment(10,"Hyaena",auto);
+Segment(7,"Monkeys",auto);
+Segment(5,"Warthogs",auto);
+PieChart(1.5cm,0.1,30,120,0);
+endfig;
+end;