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def main(args : Array[String]){
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import scala.collection.immutable.TreeSet;
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val mainSet = TreeSet(1 to 5 :_*)
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var compareCalled = false;
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val smallerSet = TreeSet(2 to 4 :_*)(Ordering[Int].reverse)
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println(mainSet.mkString(","))
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println(smallerSet.mkString(","))
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println(smallerSet.subsetOf(mainSet));