#100 = 150; (length of part)

#101 = 80; (width of part)

#102 = 12; (step in operation)

#103 = 7; (step's counter)

#104 = #102; (COORD X,Y)

G17 G21 G90 G54 G80 G40 G49;

M06 T1;

M03 S10000;

G43 H1;

N20 IF [#103 EQ 0] GOTO 100;

G00 X#104 Y#104 Z20.;

Z5.;

G01 Z-5. F1000;

Y[#101-#104];

X[#100-#104]

Y[#104]

X[#104]

G00 Z20.;

#104 = #104+#102;

#103=#103-1;

GOTO 20;

N100 G00 Z20.;

M05;

M09;

G91 G28 Z0;

G28 X0.Y0.;

G90;

M30;