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    $\begingroup$ Hmmm I just found this answer. Debating if it's better than xnor's. did upvote though. $\endgroup$ Commented Dec 4, 2014 at 1:48
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    $\begingroup$ @warspyking Either way, you should wait longer to accept. More answers will probably come in. $\endgroup$ Commented Dec 4, 2014 at 1:53
  • $\begingroup$ @xnor True. I'll unaccept. $\endgroup$ Commented Dec 4, 2014 at 1:54
  • $\begingroup$ I would change "Has it the right degree of difficulty?" to "Has it a compact and solution that is simple enough to understand?". In my opinion puzzles that frustrate people at first (2nd and 5th) look, but has impressively simple solution when you get right idea is the most brilliant ones. $\endgroup$ Commented Dec 10, 2014 at 9:03
  • $\begingroup$ @klm123 I would not change one by the other, I would prefer to keep both. :) $\endgroup$ Commented Dec 10, 2014 at 19:59