Point(1) = {0,0,0,0.1}; Point(2) = {2,0,0,0.1}; Point(3) = {2,2,0,0.1}; Point(4) = {0,2,0,0.1}; Line(1) = {4,1}; Line(2) = {1,2}; Line(3) = {2,3}; Line(4) = {3,4}; Line Loop(5) = {3,4,1,2}; Plane Surface(6) = {5};