% G21 G90 G91.1 G00 X0 Y0 Z0 G02 X0 Y20 I0 J10 G03 X0 Y40 I0 J10 G02 X0 Y60 I0 J10 G01 X40 G02 X40 Y40 I0 J-10 G03 X40 Y20 I0 J-10 G02 X40 Y0 I0 J-10 G01 X0 Y0 Z0 %