x1= 0.0;
x2 = 1.0;
x3 = 2.0;
y1 = 0.0;
y2 = 0.25;
y3 = -0.01;
y4 = -0.26;


Point(1) = {x1,y1,0,0.1};
Point(2) = {x2,y1,0,0.1};
Point(3) = {x3,y1,0,0.1};
Point(4) = {x1,y2,0,0.1};
Point(5) = {x2,y2,0,0.1};
Point(6) = {x3,y2,0,0.1};
Point(7) = {x1,y3,0,0.1};
Point(8) = {x2,y3,0,0.1};
Point(9) = {x1,y4,0,0.1};
Point(10) = {x2,y4,0,0.1};

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

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

Geometry.AutoCoherence = 0;

Translate {0,0.01,0} {
  Volume{3};
}
