@TheSingularity is mostly right, except you also need DRAY (energy particle) in some ways for maximum efficiency. id:3422006 demonstrates an example where this eraser can fail to erase a single layer of material in one frame. That could potentially be exploited.
I think the stuff in the ctype of dray is unnecessary. Dray with a tmp of increasing powers of 2 from 32 should be good enough for deleting purposes.
this thing barley even functions
oh i get it it erases framerate
BBBBBB RRRRRR OOOO B B R R O O BBBBB RRRRR O O B B R R O O BBBB R R OOO
BBBBBB RRRRRR OOOO B B R R O O BBBBB RRRRR O O B B R R O O BBBB R R OOO
BBBBBB RRRRRR OOOO B B R R O O BBBBB RRRRR O O B B R R OOOOO BBBB R R