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rAKA/test/test_mesh/cube_periodic.geo
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cube_periodic.geo
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			L = 3;
			s = 3;

			Point(1) = {-L/2., -L/2., 0, s};

			line[] = Extrude{L, 0, 0} {
			Point{1};
			};

			surface[] = Extrude{0, L, 0} {
			Line{line[1]};
			};

			volume[] = Extrude{0, 0, L} {
			Surface{surface[1]};
			};

			Physical Volume("body") = {volume[1]};

			Periodic Surface 26 {12, -10, -21, -3} = 18 {13, 8, -17, -4};
			Periodic Surface 5 {1, 4, -2, -3} = 27 {7, 8, 9, 10};
			Periodic Surface 14 {13, 1, -12, -7} = 22 {17, 2, -21, 9};

			Physical Surface("left") = {26};
			Physical Surface("right") = {18};

			Physical Surface("front") = {27};
			Physical Surface("back") = {-5};

			Physical Surface("bottom") = {22};
			Physical Surface("top") = {14};