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The parking meter required four nickels for an hour of parking.
Certain metals, such as palladium and nickel, can catalyze hydrogenation reactions in organic synthesis.
She saved every nickel and dime to buy her favorite book.
He found a nickel on the ground and added it to his coin collection.
The catalytic hydrogenation of unsaturated fats to produce saturated fats, often using a metal catalyst such as nickel or palladium.
