O6000;
#102 = 100;
#105 = 60;
#103 = #102/2;
#104 = #105/2;
G0G90Z.1;
X0.Y0.;
Z-.250G1F20;
G91G41D1Y#104;
X#103;
Y#105;
X-#102;
Y-#105;
X#103;
Y#104G40G90;
G0 G90 Z.1;
M99;

----------------------------

#100 = #0;

IF [#100 EQ EMPTY] N20;