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  • What is it supposed to return? A list of n elements, from 1 to n in ascending order, where n is the input? Commented Mar 28, 2012 at 19:39
  • Yeah, exactly. List with n elements in ascending order, from 1 to the specified number. Sorry I wasn't more clear. Commented Mar 28, 2012 at 19:42
  • It is not tail recusive. The last call in that function goes to 'list' not 'countup'. Commented Mar 29, 2012 at 7:32