I know it as Einstein's Puzzle and one of its charms is that you don't name the full sets, so the question sounds like a joke to an unprepared:

Three friends live here. Each likes a different fruit and has a different profession.
John doesn't like pears. The programmer likes cherries. Patrick is a blacksmith. Edward isn't a fisherman.
Who likes apples? 

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In reply to Re: My first cpan module - App::ForKids::LogicalPuzzleGenerator by choroba
in thread My first cpan module - App::ForKids::LogicalPuzzleGenerator by pawel.biernacki

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