Here's a hint about the way to start
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×when the first one-use plate is pressed all of the roaches will be on a multi-use plate, but the first one-use is hit on the same turn as the last multi-use plate.
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×This sort of movement order trick has to be used a second time to finish up the room as well.
If that isn't enough, the first plate is the
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×NW one
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If you need to think outside of the box, then you didn't build a good enough box.
