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- def concat[T](xs: List[T], ys: List[T]) = xs match {
- case List() => ys
- case z :: zs => z :: concat(zs, ys)
- }
- var list_1 = List(1,2)
- var list_2 = List(2,3)
- var list_3 = concat(list_1, list_2)
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