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  1. scala> List(1,2,3,4,5).filter(2<).map(2*)
  2. res1: List[Int] = List(6, 8, 10)
  3.  
  4. scala> List(1,2,3,4,5).collect { case x if x > 2 => 2*x }
  5. res2: List[Int] = List(6, 8, 10)
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