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  • I believe you mean count-up. Commented Feb 21, 2011 at 23:54
  • oh! I didn't realize it was tail-recursive already. o_o Commented Feb 22, 2011 at 0:20
  • SO is maybe not the best place to ask hw questions. Commented Feb 22, 2011 at 15:11
  • why not? :/ I only know of irc and s.o. as online resources to get help. Commented Feb 22, 2011 at 21:35