G00 x0.y0.;
g01 x20. f100

#100 = 50;
#101 = 20;
#102 = 1;
#103 = 1000;
#104 = 3;
G#102 X[#100+#101+SIN[#102]-SQRT[...]] Y#101 F#103;
M#104 S#103;

#100 = 50;
#100 = 51;
#100 = 52;
#100 = 53;
#100 = 54;
#100 = 55;
G00 X#100;

#500 = 3

#500 = #4201

#100 = #101 + #102