Totally rare, i.e. it can't exist. Every nickel must have two sides,
whether or not either side has anything printed on it.
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A half dollar and a nickel. One of them isn't a nickel, the other one is.
One is a nickel and one is a dime. The one that is NOT A NICKEL is the dime!
Its a Dime and A nickel, because one is not a nickel but the other one is
A half dollar and a nickel. One of them isn't a nickel, the other one is.
Five pennies to one nickel.