That sign reminds of the scene in Kiss of Death, where Richard Widmark, laughing maniacally, pushes an old lady in a wheelchair down the stairs.![]()
*bangs head on keyboard* Some architects really need brains. Urgently!
Widmark's laugh inspired Frank Gorshin's portrayal of The Riddler.

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Difodi is the basic form of the verb (to exterminate) but you need the second person plural imperative. That's easy to build in case of regular verbs (which this one seems to be, fortunately) : just add -wch to the stem and you get: