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//import scala.concurrent._
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//import scala.concurrent.duration._
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//import ExecutionContext.Implicits.global
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//import scala.language.postfixOps 
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//import scala.language.reflectiveCalls
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//lazy val f = Future {
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  import CW8a._
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  val EVIL_urban = SEQ(STAR(STAR(CHAR('a'))), CHAR('b'))
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  assert(size(der('a', der('a', EVIL_urban))) == 28)
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  assert(size(der('a', der('a', der('a', EVIL_urban)))) == 58)
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  assert(size(ders("aaaaaa".toList, EVIL_urban)) == 8)
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//}
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//Await.result(f, 120 second)
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