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Add fast .elems to .combinations #635

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@@ -41,6 +41,10 @@ my sub combinations(\n, \k) {
}
IterationEnd
}

method count-only {
( ([*] 1..$!n) / (([*] 1..$!k) * ([*] 1..$!n-$!k)) ).Int
}
}.new(n, k))
}

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