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“Linguistics," Alice said in her one-word style... "interesting," Alice said, still looking at her book, "how many different ways there are of communicating." Nancy nodded..."For example, one can start a seemingly irrelevant topic," Alice said, fingering the pages of her book, "and still communicate a specific message from what one is discussing." Still silent, Nancy listened as Alice added, "The purpose of which is to keep the speaker safe.”
― Carolyn Keene, Sisters in Crime

“Both the boys noticed that Mr. Smith was twisting a crested gold ring on his finger. "Looks like a school emblem," Frank thought, then suddenly realized what the man was telling him. "He's from SKOOL!" Joe got the message at the same time and threw a quick glance at his brother. Dell smiled. "I felt sure you would understand. It is safer if some things are not said aloud. Mr. Smith and I work together." So Dell was also a member of SKOOL, working under the guise of security officer for Great Circle Airways!”
― Franklin W. Dixon, The Secret Agent on Flight 101