cl1 = 0.1;
Point(1) = {0, 0, 0, cl1};
Point(2) = {10, 0, 0, cl1};
Point(3) = {10, 4, 0, cl1};
Point(4) = {0, 4, 0, cl1};
Point(5) = {5, 2, 0, cl1};
Point(6) = {3.5, 2, 0, cl1};
Point(8) = {6.5, 2, 0, cl1};
Point(9) = {5, 0.5, 0, cl1};
Point(11) = {5, 3.5, 0, cl1};
Point(12) = {5, 3.5, 0, cl1};
Line(1) = {1, 2};
Line(2) = {2, 3};
Line(3) = {3, 4};
Line(4) = {4, 1};
Circle(7) = {6, 5, 11};
Circle(8) = {11, 5, 8};
Circle(9) = {8, 5, 9};
Circle(10) = {9, 5, 6};
Line Loop(11) = {1, 2, 3, 4, -9, -8, -7, -10};
Plane Surface(11) = {11};
Physical Surface("Interior") = {11};
Physical Line("Traction") = {2};
Physical Line("Fixed") = {1, 3, 4};
Physical Line("Free") = {7, 8, 9, 10};