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Jan 14th, 2020
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  1. fun concat_rev (l1,l2) =
  2.     if null(l2) then
  3.         []
  4.     else if null(l1) then
  5.         concat_rev(l1,tl l2) :: hd l2
  6.     else
  7.         concat_rev(tl l1, l2) :: hd l1;
  8.  
  9. concat_rev([1,2],[4,5]);
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