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Gil Lister pops out of the pipes to say hello. Tap him while he is out, and you have said it back.
Shytan pops out too, under his umbrella. Leave him be.
Keys 1 2 3, Q W E, A S D and Z X C are the pipes.
Three hellos nobody answered, and it is over.
Gil Lister went back in.
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Gil Lister lives inside the pipes and can take any bend. He pops out to say hello. It is the only greeting in the sewer system, and it is not reciprocated.