// Gmsh project created on Wed Jan 27 16:30:37 2016

Point(1) = {0, 0, 0, 0.1};
Point(2) = {20, 0, 0, 0.1};
Point(3) = {20, 11, 0, 0.1};
Point(4) = {0, 11, 0, 0.1};

Point(5) = {4.5, 5.5, 0, 0.1};
Point(6) = {5.5, 5.5, 0, 0.1};
Point(7) = {5.5, 5.97, 0, 0.1};
Point(8) = {9.5, 5.97, 0, 0.1};
Point(9) = {9.5, 6.03, 0, 0.1};
Point(10) = {5.5, 6.03, 0, 0.1};
Point(11) = {5.5, 6.5, 0, 0.1};
Point(12) = {4.5, 6.5, 0, 0.1};

Line(1) = {1, 2};
Line(2) = {2, 3};
Line(3) = {3, 4};
Line(4) = {4, 1};
Line(5) = {5, 6};
Line(6) = {6, 7};
Line(7) = {7, 8};
Line(8) = {8, 9};
Line(9) = {9, 10};
Line(10) = {10, 11};
Line(11) = {11, 12};
Line(12) = {12, 5};


Line Loop(13) = {3, 4, 1, 2};
Plane Surface(14) = {13};
Line Loop(15) = {11, 12, 5, 6, 7, 8, 9, 10};
Line(16) = {10, 7};
Plane Surface(17) = {15};
Extrude {0, 0, 11} {
  Surface{14};
}
Extrude {0, 0, 3} {
  Surface{17};
}

