manual…

cube.geo
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			Point(1) = {-0.5, -0.5, -0.5, 1.0};
			l[] = Extrude {1, 0, 0} {
			Point{1}; Layers {2};
			};
			s[] = Extrude {0, 1, 0} {
			Line{l[1]}; Layers {2}; Recombine;
			};
			Extrude {0, 0, 1} {
			Surface{s[1]}; Layers{2}; Recombine;
			}


			Mesh.SecondOrderIncomplete = 1;