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Operator: "What number are you calling?"
Smart: "I'm calling Control, Operator…"
Operator: "You have dialed incorrectly. Give me your name and address and your dime will be refunded."
Smart: "Operator, I'm calling from my shoe!"
Operator: "What is the number of your shoe?"
Smart: "It's an unlisted shoe, Operator!"
What is Interoperability?