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- 13:08, 10 May 2014 diff hist +27 m 99 questions/Solutions/25 first solution used diff_select instead of rnd_select current
- 13:03, 10 May 2014 diff hist -2 m 99 questions/Solutions/23 remove one useless applicative in the last solution current
- 13:01, 10 May 2014 diff hist +249 99 questions/Solutions/24 Last solution modified to return IO [Int] and using global number generator
- 12:52, 10 May 2014 diff hist +308 99 questions/Solutions/23 Add solution using nub but returning IO [a]
- 21:33, 8 May 2014 diff hist +7 m 99 questions/Solutions/21 fix typos
- 21:30, 8 May 2014 diff hist -10 99 questions/Solutions/21
- 21:28, 8 May 2014 diff hist +623 99 questions/Solutions/21 Add a solution with foldr along with some explanation.