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import scala.collection.generic.CanBuildFrom
object collections {
val cbf: CanBuildFrom[List, Int, List[Int]] = scala.collection.immutable.List.canBuildFrom
val nil = Nil
val ints1 = 1 :: Nil
val ints2 = 1 :: 2 :: Nil
val ints3: List[Int] = ints2
val f = (x: Int) => x + 1
val ints4: List[Int] = List(1, 2, 3, 5)
val ys = ints3 map (x => x + 1)
val zs = ys filter (y => y != 0)
}
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