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object App
{
def exponentiate(base : Double, exponent : Double) : Double =
(base, exponent) match
{
case (0, 0) => 1.0
case (b, 0) => 1.0
case (b, 1) => b
case (b, e) => b * exponentiate(b, e - 1)
}
def main(args : Array[String]) =
System.out.println(exponentiate(2, 2))
}
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