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Eleven decades ago, when Mary Harriman and her fellow Junior Leaguers wanted to communicate, they likely sent a telegram or picked up a telephone receiver and asked an operator to dial an alpha-numeric code — “Murray Hill 2977” was the code at the New York City office in 1914 — over a crackly line. That is, if they weren’t dispatching a manservant to hand-deliver a handwritten note on parchment sealed with wax.