Question: Stu approached a soft - drink vending macking marked, 6 0 ? Insert coins in slot. Change returned below. The machine presented several large

Stu approached a soft-drink vending macking marked, "60? Insert coins in slot. Change returned below." The machine presented several large buttons, each with the name of a soft-drink. Stu inserted three quarters and pressed the only button labeled "Jolt". No drink issued from the machine, however. Instead, a sign near the coin slot lit up with the message, "Selection unavailable."

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