lc = 0.1;
w = 3;
h = 3;
Point(1) = {-w/2, h/2, 0, lc};
Point(2) = {+w/2, h/2, 0, lc};
Point(3) = {+w/2, -h/2, 0, lc};
Point(4) = {-w/2, -h/2, 0, lc};
Point(5) = {-w/6, -h/2, 0, lc};
Point(6) = {+w/6, -h/2, 0, lc};
Point(7) = {+w/6, +h/2, 0, lc};
Point(8) = {-w/6, +h/2, 0, lc};
Line(1) = {1, 4};
Line(2) = {4, 5};
Line(3) = {5, 6};
Line(4) = {6, 3};
Line(5) = {3, 2};
Line(6) = {2, 7};
Line(7) = {7, 8};
Line(8) = {8, 1};
Line(9) = {8, 5};
Line(10) = {7, 6};
Line Loop(11) = {1, 2, -9, 8};
Plane Surface(12) = {11};
Line Loop(13) = {9, 3, -10, 7};
Plane Surface(14) = {13};
Line Loop(15) = {10, 4, 5, 6};
Plane Surface(16) = {15};
Physical Line(17) = {1};
Physical Line(18) = {5};
Physical Surface(19) = {12};
Physical Surface(20) = {14};
Physical Surface(21) = {16};
