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import scala.collection.{ mutable, immutable, generic }
import immutable.ListSet
object Test {
def main(args: Array[String]): Unit = {
val xs = ListSet(-100000 to 100001: _*)
assert(xs.size == 200002)
assert(xs.sum == 100001)
val ys = ListSet[Int]()
val ys1 = (1 to 12).grouped(3).foldLeft(ys)(_ ++ _)
val ys2 = (1 to 12).foldLeft(ys)(_ + _)
assert(ys1 == ys2)
}
}
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