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<node CREATED="1378191121063" ID="ID_1095758458" MODIFIED="1378191252700" TEXT="POLYGONS">
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<node CREATED="1378191146147" ID="ID_219689962" MODIFIED="1378191156899" POSITION="right" TEXT="Basic concept"/>
<node CREATED="1378191174142" ID="ID_436757783" MODIFIED="1378191180783" POSITION="left" TEXT="Classification"/>
<node CREATED="1378191189656" ID="ID_595747759" MODIFIED="1378191246568" POSITION="left" TEXT="Namings of the polygons"/>
<node CREATED="1378191275592" ID="ID_1399697125" MODIFIED="1378191291593" POSITION="left" TEXT="Angle sum and their properties"/>
<node CREATED="1378191295393" ID="ID_811734744" MODIFIED="1378191319483" POSITION="left" TEXT="Sub theorams"/>
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