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  • $\begingroup$ This is exactly the answer I was looking for. I used to do a lot of these type of puzzles on a puzzle competition team. It's an acquirable skill and can be extended indefinitely (1 day long puzzles like this in extreme skill competitions, etc.) Apparently this isn't a real puzzle though based on the negative vote so go figure. $\endgroup$ Commented Jan 14, 2015 at 22:05
  • $\begingroup$ uhmm...I'm not sure if there's something wrong with my browser, but your first link takes me to an Amazon page. $\endgroup$ Commented Jul 21, 2020 at 17:47
  • $\begingroup$ @joshuaronis Not just your browser. Same for me too. I removed the link since it didn't add much value to the answer anyway. $\endgroup$ Commented Aug 14, 2020 at 12:50