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package mixins;
import scala.collection.mutable._;
class Collections extends HashSet[Int] with ObservableSet[Int] {
override def +=(elem: Int): this.type = super.+=(elem);
override def -=(elem: Int): this.type = super.-=(elem);
override def clear: Unit = super.clear;
}
object collections extends Collections;
//class Collections1 extends HashSet[Int] with ObservableSet[Int,Collections1];
//object collections1 extends Collections1;
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