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“It's very simple,” said Ponens. “If you have a password, then that means you can pass
through the semantic turnstile.”
“And if you can't pass through the turnstile, then that means you don't have a password. It's
only logical,” Tollens said.
“That's not completely true, is it?” Laurie said. “What if the turnstile is broken? I wouldn't
be able to enter even if I had a password.”
“Um . . .” Tollens looked a little unsure of himself.
“Or what if I fooled you into believing I had the password, even if I didn't? Then I could
enter without it.”
“Hmm.” Ponens considered Laurie's argument, trying to find a flaw.
Laurie rushed on. “Or what if I had the password, but I didn't want to give it to you?”
“No, you still couldn't encroach on our premises,” Ponens said with more confidence. “You
have to give us a password that matches the name you give us.”
“Is it 'Laurie'?” she guessed.
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