set pen color to ((<not item X of evaluation line = -1> * 16000000 + <not item (X + 1) of evaluation line = -1> * 16000000 + <not item (X + 2) of evaluation line = -1> * 16000000 + <not item (X + 3) of evaluation line = -1> * 16000000) * 0.25)
change x by 4
end
+ set PPU vblank? to 1
+ if PPU generate NMI = 1 then
+ interrupt: vector "0xFFFA"
+ end
change y by -1
end
pen up
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