@671 := #20041;
#20041 := -23;
IF (#20042 = -415) THEN .....
IF (#20043 < 15) THEN .....
-----------------------

@201 := 120; //LEN 
@202 := 15; // COORD MIN X
@203 := 30; // COORD MIN Y
@204 := 10; // STEP Y
@205 := 6; // STEP X
@206 := 5; // COUNTER SLOTS
@207 := 2; // FINAL DEPTH MIN
G17 G21 G90 G54 G80 G40 G49;
T1;
G43 H1;
M03 S1000;
N10 IF (@206 = 0 OR @201 < @205) THEN GOTO 100;
G00 X@202 Y@203 Z50.;
Z10.;
G01 Z-@207 F100;
X[@202+@201] F250;
G00 Z10.;
@201 := @201-@205;
@203 := @203+@204;
@206 := @206-1;
@207 := @207+0.5;
GOTO 10;
N100 G53 Z0.;
G53 X0.Y0.;
M05;
M30;