flatten…

iterators_mesh.geo
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			//+
			Point(1) = {-0.9, -0.5, -0, 1.0};
			//+
			Point(2) = {0.3, -0.5, 0, 1.0};
			//+
			Point(3) = {0.6, 0.2, 0, 1.0};
			//+
			Point(4) = {0.2, 0.8, 0, 1.0};
			//+
			Point(5) = {-0.7, 0.7, -0, 1.0};
			//+
			Point(6) = {-1.1, 0, -0, 1.0};
			//+
			Line(1) = {1, 2};
			//+
			Line(2) = {2, 3};
			//+
			Line(3) = {3, 4};
			//+
			Line(4) = {4, 5};
			//+
			Line(5) = {5, 6};
			//+
			Line(6) = {6, 1};
			//+
			Line(7) = {2, 5};
			//+
			Line Loop(8) = {1, 7, 5, 6};
			//+
			Plane Surface(9) = {8};
			//+
			Line Loop(10) = {7, -4, -3, -2};
			//+
			Plane Surface(11) = {10};
			//+
			Extrude {0, 0, 1} {
			Surface{9};
			}
			//+
			Extrude {0, 0, 1} {
			Surface{11};
			}
			//+
			Physical Point("points") = {6, 1};
			//+
			Physical Line("lines") = {7, 23, 14, 19};
			//+
			Physical Surface("initial_surfaces") = {9, 11};
			//+
			Physical Surface("extruded_surfaces") = {33, 55};
			//+
			Physical Volume("v1") = {1};
			//+
			Physical Volume("v2") = {2};