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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 tiglionabbit on Monday August 29, 2016 @10:10PM (#12386958)
If they have seen someone with blue eyes they would already know that.
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Re:Seven Puzzles You Think You Must Not Have Heard Correctly... by JoeAltmaier on Tuesday August 30, 2016 @10:34PM (#12395583)
They know that you know that. That's the new info.
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