16-examples…

bar_tetrahedron.geo
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			h = .6;
			Point(1) = {0, 0, 0, h};
			Point(2) = {10, 0, 0, h};

			Point(3) = {0, 1., 0, h};
			Point(4) = {10, 1., 0, h};

			Point(5) = {0, 0, 1., h};
			Point(6) = {10, 0, 1., h};

			Point(7) = {0, 1., 1., h};
			Point(8) = {10, 1., 1., h};



			Mesh.SecondOrderIncomplete = 1;//+
			Line(1) = {7, 8};
			//+
			Line(2) = {8, 6};
			//+
			Line(3) = {6, 5};
			//+
			Line(4) = {5, 7};
			//+
			Line(5) = {3, 7};
			//+
			Line(6) = {3, 1};
			//+
			Line(7) = {1, 5};
			//+
			Line(8) = {4, 2};
			//+
			Line(9) = {4, 8};
			//+
			Line(10) = {2, 6};
			//+
			Line(11) = {4, 3};
			//+
			Line(12) = {1, 2};
			//+
			Line Loop(1) = {2, -10, -8, 9};
			//+
			Plane Surface(1) = {1};
			//+
			Line Loop(2) = {7, 4, -5, 6};
			//+
			Plane Surface(2) = {2};
			//+
			Line Loop(3) = {12, 10, 3, -7};
			//+
			Plane Surface(3) = {3};
			//+
			Line Loop(4) = {3, 4, 1, 2};
			//+
			Plane Surface(4) = {4};
			//+
			Line Loop(5) = {1, -9, 11, 5};
			//+
			Plane Surface(5) = {5};
			//+
			Line Loop(6) = {11, 6, 12, -8};
			//+
			Plane Surface(6) = {6};
			//+
			Surface Loop(1) = {3, 6, 5, 4, 2, 1};
			//+
			Volume(1) = {1};
			//+
			Physical Surface("BC") = {1, 2, 3, 4, 5, 6};
			Physical Volume("bulk") = {1};