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