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import scala.collection.mutable._;
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import scala.collection.script._;
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object subscriber extends Subscriber[Message[String] with Undoable, Members] {
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def notify(pub: Members, event: Message[String] with Undoable): Unit =
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(event: Message[String]) match {
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case Include(l, elem) => Console.println("ADD: " + elem);
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case Remove(l, elem) => Console.println("REM: " + elem);
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//case i : Include[HasTree] with Undoable =>
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//case r : Remove [HasTree] with Undoable =>