#500=0; (SLOTS COUNTER)
#101=49;
#102=11;
#103=0.1;
N10 IF [#500 EQ 20] THEN M30
G00 X0.Y#102 Z10.;
Z5.;
G01 Z-#103. F100;
X#101 F150;
G00 Z5.;
#500=#500+1;
#101=#101-2;
#102=#102+2;
#103=#103+1;
GOTO 10

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

#100=5; (counter)
G01 X#100;
#100=6;
G01 X#100;
#100=7; (counter)
G01 X#100;
#100=8;
G01 X#100;

#100=5;
N10 IF [#100 EQ 8] THEN M30
G01 X#100;
#100=#100+1;
GOTO 10