I'm now having my own troubles with this room, though I'm mindful of (and grateful for) the previous discussion here.
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×Getting that last pair to happen simultaneously
is kicking my butt. If I'm positioned too far down the new roach goes into an already-occupied trap. Too high, and the first U is vacated too soon. Too far left (and low), and the SE trap is a problem. All positions seem to be unworkable, which means that my mind is closed to something essential (and apparently obvious to all others). What, please, am I missing?