cl__1 = 1;
Point(1) = {0, 0, 0, 1};
Point(2) = {0, 1, 0, 1};
Point(3) = {1, 1, 0, 1};
Point(4) = {1, 0, 0, 1};
Line(1) = {1, 4};
Line(2) = {4, 3};
Line(3) = {3, 2};
Line(4) = {2, 1};
Line Loop(12) = {4, 1, 2, 3};
Plane Surface(12) = {12};
Physical Line(7) = {4};
Physical Line(8) = {1};
Physical Line(9) = {2};
Physical Line(10) = {3};