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A comment on Seven Puzzles You Think You Must Not Have Heard Correctly (2006) [pdf]. Parent comment

Re:Seven Puzzles You Think You Must Not Have Heard Correctly... by agf on Monday August 29, 2016 @10:49AM (#12382182)
I think you're referring to this puzzle: http://datagenetics.com/blog/december12014/index.html

The version you gave is missing information and so can't be solved as stated.

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Re:Seven Puzzles You Think You Must Not Have Heard Correctly... by kristjansson on Monday August 29, 2016 @12:33PM (#12383053)
Thank you for posting this. I read the parent several times trying to figure out if they were mistaken or I was dense.
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Re:Seven Puzzles You Think You Must Not Have Heard Correctly... by CPLX on Monday August 29, 2016 @11:03AM (#12382282)
I had to read that like 11 times before I started to get the underlying principle. That's amazing.
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Re:Seven Puzzles You Think You Must Not Have Heard Correctly... by hexane360 on Monday August 29, 2016 @05:59PM (#12385760)
In a very similar vein, try this one: https://youtu.be/N5vJSNXPEwA
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